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

int main(){
  long long int a,v,b,w,t;
  cin >> a >> v >> b >> w >> t;
  if(v-w>0 && (v-w)*t >= abs(a-b)){
    cout << "YES" << endl;
  }
  else cout << "NO" << endl;
}