122A - Lucky Division.cpp

//4027427   Jul 5, 2013 6:40:47 PM	fuwutu	 122A - Lucky Division	 GNU C++0x	Accepted	15 ms	0 KB
#include <iostream>

using namespace std;

bool lucky(int n)
{
    while (n != 0)
    {
        if (n % 10 != 4 && n % 10 != 7)
        {
            return false;
        }
        n /= 10;
    }
    return true;
}

bool almost_lucky(int n)
{
    if (lucky(n))
    {
        return true;
    }

    for (int i = 2; i * i <= n; ++i)
    {
        if (n % i == 0 && (lucky(i) || lucky(n / i)))
        {
            return true;
        }
    }

    return false;
}

int main()
{
    int n;
    cin >> n;
    if (almost_lucky(n))
    {
        cout << "YES" << endl;
    }
    else
    {
        cout << "NO" << endl;
    }

    return 0;
}