#include <iostream>
using namespace std;
int main() {
	int x, y, z, n, m, cnt = 0;
	cin >> x >> y >> z >> n >> m;
	for (int G = 0; G * x <= n && G <= m; G++)
		for (int M = 0; M * y + G * x <= n && M + G <= m; M++) {
			int xj = (n - G * x - M * y) * z;
			if (G + M + xj == m)
				cnt++;
		}
	cout << cnt << endl;
	return 0;
}//不是答案，求复制