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

#include<atcoder/modint>
using namespace atcoder;
using mint=modint1000000007;

void solve(){
    int A,B,C,D,S;
    cin>>A>>B>>C>>D>>S;
    cout<<(A*C+B*D<=S?"Yes\n":"No\n");
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int T=1;
    // cin>>T;
    while(T--)solve();
}