#include <bits/stdc++.h>
using namespace std;
const int INF=1e9+5;
typedef long long ll;

int main() {
  ll A,V,B,W,T;
  cin>>A>>V>>B>>W>>T;
  if(abs(A-B)<=(V-W)*T){
    cout<<"YES"<<endl;
  }
  else{
    cout<<"NO"<<endl;
  }
}
