#include<iostream>
#include<cmath>
using namespace std;
int main() {
	int roster,hen,chicken,price,number;
	cin>>roster>>hen>>chicken>>price>>number;
	int cnt = 0;
	for(int i=0;i<=number/roster;i++){ //i代表公鸡
		for(int j=0;j<=number/hen;j++){ // j代表母鸡
			for(int k=0;k<=number;k+=chicken){
				if(k +j + i == number && i * roster + j * hen + k /chicken == price){
					cnt++;
				}
			}
		}
	}
	cout<<cnt;
}