diff --git "a/alstjr7437/BFS/\355\206\240\353\247\210\355\206\240.py" "b/alstjr7437/BFS/\355\206\240\353\247\210\355\206\240.py"
new file mode 100644
index 00000000..45c32e7b
--- /dev/null
+++ "b/alstjr7437/BFS/\355\206\240\353\247\210\355\206\240.py"
@@ -0,0 +1,40 @@
+from collections import deque
+import sys
+
+input = sys.stdin.readline
+
+dx = [0,0,-1,1]
+dy = [1,-1,0,0]
+
+n, m = map(int, input().split())
+tomato = []
+visited = [[0] * n for _ in range(m)]
+
+for _ in range(m):
+    tomato.append(list(map(int, input().split())))
+
+queue = deque()
+
+for y in range(m):
+    for x in range(n):
+        if tomato[y][x] == 1:
+            queue.append((y,x))
+            visited[y][x] = 1
+
+while queue:
+    y, x = queue.popleft()
+    for i in range(4):
+        nx = x + dx[i]
+        ny = y + dy[i]
+        if nx >= n or nx < 0 or ny >= m or ny < 0:
+            continue
+        if tomato[ny][nx] != -1 and visited[ny][nx] == 0:
+            visited[ny][nx] = 1
+            tomato[ny][nx] = tomato[y][x] + 1
+            queue.append((ny, nx))
+
+if any(0 in l for l in tomato):
+    print(-1)
+else : 
+    test = max(map(max, tomato))
+    print(test - 1) 
diff --git a/alstjr7437/README.md b/alstjr7437/README.md
index 253921c0..c132ba86 100644
--- a/alstjr7437/README.md
+++ b/alstjr7437/README.md
@@ -24,4 +24,5 @@
 | 22차시 | 2024.04.13 |  BFS  | <a href="https://www.acmicpc.net/problem/11724">연결 요소의 개수</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/78 |
 | 21차시 | 2024.04.06 |  비트마스킹  | <a href="https://www.acmicpc.net/problem/11723">집합</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/74 |
 | 22차시 | 2024.04.13 |  BFS  | <a href="https://www.acmicpc.net/problem/11724">연결 요소의 개수</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/78 |
-| 23차시 | 2024.05.01 |  큐  | <a href="https://school.programmers.co.kr/learn/courses/30/lessons/42587">프로세스</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/79 |
\ No newline at end of file
+| 23차시 | 2024.05.01 |  큐  | <a href="https://school.programmers.co.kr/learn/courses/30/lessons/42587">프로세스</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/79 |
+| 24차시 | 2024.05.14 |  BFS  | <a href="https://www.acmicpc.net/problem/7576">토마토</a> | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/187 |
\ No newline at end of file