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

int main(){
  int64_t A,B,V,W,T;
  cin>>A>>V;
  cin>>B>>W;
  cin>>T;

  int64_t dis=(int64_t)abs(A-B);

  if(T*V>=T*W+dis) cout<<"YES"<<endl;
  else cout<<"NO"<<endl;
}
