diff --git a/README.md b/README.md
index ec9fffb7ab..6550047ede 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,20 @@
 # kotlin-lotto
 
+# 로또
+## 기능 요구 사항
+- 로또 구입 금액을 입력하면 구입 금액에 해당하는 로또를 발급해야 한다.
+- 로또 1장의 가격은 1000원이다.
+
+## 기능 목록
+- [x] 로또 생성기는 1~45까지 중복되지 않은 숫자 6개를 생성한다.
+- [x] 로또 샵에서는 몇장을 살 건지 받아서 해당하는 만큼 로또를 산다.
+- [x] 6개 숫자가 모두 맞으면 1등이고, 20억을 받는다.
+- [x] 5개 숫자가 맞으면 2등이고, 150만원을 받는다.
+- [x] 4개 숫자가 맞으면 3등이고, 5만원을 받는다.
+- [x] 3개 숫자가 맞으면 4등이고 5천원을 받는다.
+- [] 로또 수익 계산기는 결과를 받아서 수익을 계산한다.
+
+# 문자열 계산기
 ## 기능 요구 사항
 - 쉼표(,) 또는 콜론(:)을 구분자로 가지는 문자열을 전달하는 경우 구분자를 기준으로 분리한 각 숫자의 합을 반환
 - (예: “” => 0, "1,2" => 3, "1,2,3" => 6, “1,2:3” => 6)
diff --git a/src/main/kotlin/lotto/BenefitCalculator.kt b/src/main/kotlin/lotto/BenefitCalculator.kt
new file mode 100644
index 0000000000..1c8eeb0f71
--- /dev/null
+++ b/src/main/kotlin/lotto/BenefitCalculator.kt
@@ -0,0 +1,32 @@
+package lotto
+
+import java.math.RoundingMode
+import java.text.DecimalFormat
+
+class BenefitCalculator {
+    fun calculate(result: Map<Int, Int>): String {
+        val spend = result.map { it.value }.sum() * LOTTO_PRICE
+        val benefit = result.map { 
+            when (it.key) {
+                1 -> WINNER_REWARD * it.value
+                2 -> SECOND_REWARD * it.value
+                3 -> THIRD_REWARD * it.value
+                4 -> FORTH_REWARD * it.value
+                else -> 0
+            }
+        }.sum()
+        
+        val rate = benefit.toDouble() / spend
+        df.roundingMode = RoundingMode.FLOOR
+        return df.format(rate)
+    }
+    
+    companion object {
+        private const val WINNER_REWARD = 2000000000
+        private const val SECOND_REWARD = 1500000
+        private const val THIRD_REWARD = 50000
+        private const val FORTH_REWARD = 5000
+        private const val LOTTO_PRICE = 1000
+        private val df = DecimalFormat("0.00")
+    }
+}
diff --git a/src/main/kotlin/lotto/LottoGame.kt b/src/main/kotlin/lotto/LottoGame.kt
new file mode 100644
index 0000000000..ab452f9a28
--- /dev/null
+++ b/src/main/kotlin/lotto/LottoGame.kt
@@ -0,0 +1,52 @@
+package lotto
+
+import lotto.view.InputView
+import lotto.view.ResultView
+
+class LottoGame {
+    fun match(
+        userLotto: Set<Int>,
+        winningLotto: Set<Int>,
+    ): Int {
+        val matchCount = userLotto.intersect(winningLotto.toSet()).size
+        return rank(matchCount)
+    }
+
+    private fun rank(
+        matchCount: Int,
+    ): Int {
+        return when (matchCount) {
+            6 -> 1
+            5 -> 2
+            4 -> 3
+            3 -> 4
+            else -> 0
+        }
+    }
+}
+
+fun main() {
+    val inputView = InputView()
+    val resultView = ResultView()
+    val shop = LottoShop()
+    val game = LottoGame()
+    val money = inputView.get("구입금액을 입력해 주세요.")
+    // 얼마를 살 수 있다. 
+    val count = money / 1000
+    val lottos = shop.buy(count)
+    println("${count}개를 구매했습니다.")
+    lottos.forEach { 
+        println(it)
+    }
+    val winningLotto = inputView.getWinningLotto("지난 주 당첨 번호를 입력해 주세요.")
+    // 맞춰 본다.
+    val result = lottos.groupingBy {
+        game.match(it, winningLotto)
+    }.eachCount()
+    
+    val benefitCalculator = BenefitCalculator()
+    val benefit = benefitCalculator.calculate(result)
+    resultView.show(result, benefit)
+}
+
+
diff --git a/src/main/kotlin/lotto/LottoGenerator.kt b/src/main/kotlin/lotto/LottoGenerator.kt
new file mode 100644
index 0000000000..4d66d5ac89
--- /dev/null
+++ b/src/main/kotlin/lotto/LottoGenerator.kt
@@ -0,0 +1,18 @@
+package lotto
+
+import kotlin.random.Random
+
+class LottoGenerator {
+    fun generate(): Set<Int> {
+        val numbers = mutableSetOf<Int>()
+        while (numbers.size < LIMIT_SIZE) {
+            numbers.add(Random.nextInt(MAXIMUM))
+        }
+        return numbers
+    }
+    
+    companion object {
+        private const val MAXIMUM = 45
+        private const val LIMIT_SIZE = 6 
+    }
+}
diff --git a/src/main/kotlin/lotto/LottoShop.kt b/src/main/kotlin/lotto/LottoShop.kt
new file mode 100644
index 0000000000..390a5a83bc
--- /dev/null
+++ b/src/main/kotlin/lotto/LottoShop.kt
@@ -0,0 +1,13 @@
+package lotto
+
+class LottoShop {
+    fun buy(count: Int): List<Set<Int>> {
+        val lottoGenerator = LottoGenerator()
+        val lottos = mutableListOf<Set<Int>>()
+        repeat(count) {
+            lottos.add(lottoGenerator.generate())
+        }
+        
+        return lottos
+    }
+}
diff --git a/src/main/kotlin/lotto/view/InputView.kt b/src/main/kotlin/lotto/view/InputView.kt
new file mode 100644
index 0000000000..4bd5ce3169
--- /dev/null
+++ b/src/main/kotlin/lotto/view/InputView.kt
@@ -0,0 +1,14 @@
+package lotto.view
+
+class InputView {
+    fun get(prompt: String): Int {
+        print(prompt)
+        return readln().toInt()
+    }
+    
+    fun getWinningLotto(prompt: String): Set<Int> {
+        print(prompt)
+        return readln().split(",").map { it.toInt() }.toSet()
+    }
+    
+}
diff --git a/src/main/kotlin/lotto/view/ResultView.kt b/src/main/kotlin/lotto/view/ResultView.kt
new file mode 100644
index 0000000000..88e254fca5
--- /dev/null
+++ b/src/main/kotlin/lotto/view/ResultView.kt
@@ -0,0 +1,23 @@
+package lotto.view
+
+class ResultView {
+    fun show(result: Map<Int, Int>, benefit: String) {
+        println("당첨 통계")
+        println("---------")
+        (1..4).reversed().forEach { 
+            showOne(it, result.getOrDefault(it, 0))
+        }
+        
+        val bep = if (benefit.toDouble() > 1.0) "이익" else "손해"
+        println("총 수익률은 ${benefit}입니다. (기준이 1이기 때문에 결과적으로 ${bep}라는 의미임)")
+    }
+    
+    private fun showOne(rank: Int, count: Int) {
+        when (rank) {
+            1 -> println("6개 일치 (2000000000원) - ${count}개")
+            2 -> println("5개 일치 (1500000원) - ${count}개")
+            3 -> println("4개 일치 (50000원) - ${count}개")
+            4 -> println("3개 일치 (5000원) - ${count}개")
+        }
+    }
+}
diff --git a/src/test/kotlin/lotto/BenefitCalculatorTest.kt b/src/test/kotlin/lotto/BenefitCalculatorTest.kt
new file mode 100644
index 0000000000..2d3ead2fd6
--- /dev/null
+++ b/src/test/kotlin/lotto/BenefitCalculatorTest.kt
@@ -0,0 +1,22 @@
+package lotto
+
+import org.assertj.core.api.AssertionsForClassTypes.assertThat
+import org.junit.jupiter.api.Test
+
+class BenefitCalculatorTest {
+    
+    @Test
+    fun `14장 중에 4등 1장 미당첨 13장일 경우 수익률은 0,35이다`() {
+        val calculator = BenefitCalculator()
+        val result = mapOf(
+            1 to 0,
+            2 to 0,
+            3 to 0,
+            4 to 1,
+            0 to 13
+        )
+        
+        val actual = calculator.calculate(result)
+        assertThat(actual).isEqualTo("0.35")
+    }
+}
diff --git a/src/test/kotlin/lotto/LottoGameTest.kt b/src/test/kotlin/lotto/LottoGameTest.kt
new file mode 100644
index 0000000000..c961598de0
--- /dev/null
+++ b/src/test/kotlin/lotto/LottoGameTest.kt
@@ -0,0 +1,77 @@
+package lotto
+
+import io.kotest.matchers.shouldBe
+import org.junit.jupiter.api.Test
+
+class LottoGameTest {
+    
+    @Test
+    fun `1등은 6개 일치` () {
+        val lottoGame = LottoGame()
+        val userLotto = setOf(1, 2, 3, 4, 5, 6)
+        val winningLotto = setOf(1, 2, 3, 4, 5, 6)
+        val actual = lottoGame.match(userLotto, winningLotto)
+        
+        actual shouldBe 1
+    }
+    
+    @Test
+    fun `2등은 5개 일치`() {
+        val lottoGame = LottoGame()
+        val userLotto = setOf(1, 2, 3, 4, 5, 6)
+        val winningLotto = setOf(1, 2, 3, 4, 5, 7)
+        val actual = lottoGame.match(userLotto, winningLotto)
+
+        actual shouldBe 2
+    }
+    
+    @Test
+    fun `3등은 4개 일치`() {
+        val lottoGame = LottoGame()
+        val userLotto = setOf(1, 2, 3, 4, 5, 6)
+        val winningLotto = setOf(1, 2, 3, 4, 7, 8)
+        val actual = lottoGame.match(userLotto, winningLotto)
+        
+        actual shouldBe 3
+    }
+    
+    @Test
+    fun `4등은 3개 일치`() {
+        val lottoGame = LottoGame()
+        val userLotto = setOf(1, 2, 3, 4, 5, 6)
+        val winningLotto = setOf(1, 2, 3, 7, 8, 9)
+        val actual = lottoGame.match(userLotto, winningLotto)
+
+        actual shouldBe 4
+    }
+    
+    @Test
+    fun `2개 경우 일치 하면 0`(userLotto: Set<Int>) {
+        val lottoGame = LottoGame()
+        val userLotto = setOf(1, 2, 12, 13, 14, 15)
+        val winningLotto = setOf(1, 2, 3, 7, 8, 9)
+        val actual = lottoGame.match(userLotto, winningLotto)
+
+        actual shouldBe 4
+    }
+
+    @Test
+    fun `1개 경우 일치 하면 0`(userLotto: Set<Int>) {
+        val lottoGame = LottoGame()
+        val userLotto = setOf(1, 11, 12, 13, 14, 16)
+        val winningLotto = setOf(1, 2, 3, 7, 8, 9)
+        val actual = lottoGame.match(userLotto, winningLotto)
+
+        actual shouldBe 4
+    }
+
+    @Test
+    fun `0개 경우 일치 하면 0`(userLotto: Set<Int>) {
+        val lottoGame = LottoGame()
+        val userLotto = setOf(10, 11, 12, 13, 14, 16)
+        val winningLotto = setOf(1, 2, 3, 7, 8, 9)
+        val actual = lottoGame.match(userLotto, winningLotto)
+
+        actual shouldBe 4
+    }
+}
diff --git a/src/test/kotlin/lotto/LottoGeneratorTest.kt b/src/test/kotlin/lotto/LottoGeneratorTest.kt
new file mode 100644
index 0000000000..7fc10fe137
--- /dev/null
+++ b/src/test/kotlin/lotto/LottoGeneratorTest.kt
@@ -0,0 +1,22 @@
+package lotto
+
+import io.kotest.matchers.shouldBe
+import org.junit.jupiter.api.Test
+
+class LottoGeneratorTest {
+    
+    @Test
+    fun `로또 생성기는 숫자 6개를 생성한다`() {
+        val lottoGenerator = LottoGenerator()
+        val lotto = lottoGenerator.generate()
+        lotto.size shouldBe 6
+    }
+
+    @Test
+    fun `로또 생성기는 숫자가 겹치지 않는다`() {
+        val lottoGenerator = LottoGenerator()
+        val lotto = lottoGenerator.generate()
+        lotto.distinct().size shouldBe 6
+    }
+    
+}
diff --git a/src/test/kotlin/lotto/LottoShopTest.kt b/src/test/kotlin/lotto/LottoShopTest.kt
new file mode 100644
index 0000000000..2fe38b701e
--- /dev/null
+++ b/src/test/kotlin/lotto/LottoShopTest.kt
@@ -0,0 +1,15 @@
+package lotto
+
+import io.kotest.matchers.shouldBe
+import org.junit.jupiter.api.Test
+
+class LottoShopTest {
+    
+    @Test
+    fun `로또 n장 사기`() {
+        val lottoShop = LottoShop()
+        val count = 5
+        val lottos = lottoShop.buy(5)
+        lottos.size shouldBe count
+    }
+}