#include<iostream>
using namespace std;
int main(){
    int x,y,z,n,m;
    long long c=0;
    cin>>x>>y>>z>>n>>m;
    for(long long i = 0;i<=m;i++){
        for(long long j = 0;j<=m;j++){
            for(long long l = 0;l<=m;l+=z){
                c += (i*x+j*y+l/z == n && i+j+l == m)?1:0;
            }
        }
    }
    cout<<c;
    return 0;
}