C++ :

#include <iostream>
using namespace std;
int main() {
 int x, y, z, n, m, cnt = 0;
 cin >> x >> y >> z >> n >> m;
 for (int gj = 0; gj * x <= n && gj <= m; gj++)
 for (int mj = 0; mj * y + gj * x <= n && mj + gj <= m; mj++) {
 int xj = (n - gj * x - mj * y) * z;
 if (gj + mj + xj == m)
 cnt++;
 }
 cout << cnt << endl;
 return 0;
}