#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

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

