#include<bits/stdc++.h>
using namespace std;
int main()
{
  long long int a,b,s=0,s1=0,v,w,t;
    cin>>a>>v;
    cin>>b>>w;
    cin>>t;
    
    if((v-w)*t>= abs(a-b))
        cout<<"YES";
    else
        cout<<"NO";
}