#include<bits/stdc++.h>
using namespace std;
 
 
int main(){

    long long A,V,B,W,T;
    cin >> A >> V >> B >> W >> T;

    if(abs(A-B) + W*T <= V*T){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;
    }

}