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

const long long inf = 2e18;
const long long prime = 998244353;

void YNcout(bool condition) {
    if (condition) cout << "Yes" << endl;
    else cout << "No" << endl;
}

int main() { //メイン関数
    int a, b, c, d, s;
    cin >> a >> b >> c >> d >> s;
    YNcout(a * c + b * d <= s);
}