#include <bits/stdc++.h>
using namespace std;
int main() {
    int a, b, c, d, p, q, r, s, t;
    cin >> a >> b >> c >> d >> p >> q >> r >> s >> t;

    int tot = a*p + b*q + c*r + d*s;
    if (tot <= t) cout << "Yes" << endl;
    else cout << "No" << endl;
    return 0;
}