求条玄关

#include <iostream>
using namespace std;

int x, y, z, n, m, cnt;

int main()
{
    cin >> x >> y >> z >> n >> m;
    for (int i =  0; i <= m; ++i)
        {
            for (int j = 0; i + j <= m; ++j)
                {
                    int k = m - i - j;
                    if (i / x + j / y + k / z == n && k % z == 0) ++cnt;
                }
        }
    cout << cnt;
    return 0;
}