#include<bits/stdc++.h> 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;

}