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

typedef long long ll;

ll a, v, b, w, t;

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