#include <bits/stdc++.h>

using namespace std;

using pii = pair<int, int>;
using ll = long long;
const int N = 2000010, MOD = 998244353, INF = 0x3f3f3f3f;
int n, m, w[N];


void solve() {
    int a, b, c, d, e;
    scanf("%d%d%d%d%d", &a, &b, &c, &d, &e);
    puts(a * c + b * d <= e ? "Yes" : "No");
}

int main() {
    int T = 1;
    // scanf("%d", &T);
    while (T--) solve();
    return 0;
}