#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++) {
            int xj = (n - gj * x - mj * y) * z;
            if (gj + mj + xj == m)
                cnt++;
        }
    cout << cnt << endl;
    return 0;
}