#include<bits/stdc++.h>
using namespace std;
int x,y,z,n,m,cnt = 0;

int main()
{
	cin >> x>> y>> z>> n>> m;
	for(int i = 0;i<=m;i++)
	{
		for(int j = 0;j<=m-x;j++)
		{
			int f = 0;
			int k = m-i-j;
			if(x*i+y*j+k/z == n)
			{
				//cout<< i<<" "<< j<<" "<<k<<endl;
				cnt++;
			}
		}
	}
	cout<< cnt;
	return 0;
}