#include <bits/stdc++.h>
using namespace std;

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

int main()
{
	cin >> x >> y >> z >> n >> m;
	for (int i = 0;i <= m + 1;i++)
	{
		for (int j = 0;j <= m - i + 1;j++)
		{
			int k = m - i - j;
			if (i * x + j * y + k * z == n)
				ans++;
		}
	}
	cout << ans;
	return 0; 
}

样例全没过······ 大佬救我！！！