#include <iostream>
using namespace std;
typedef long long ll;
ll a,b,c,d,e;
int main(void){
    cin>>a>>b>>c>>d>>e;
    if(b<=d){cout<<"NO"<<endl;return 0;}
    if(abs(a-c)<=(b-d)*e)cout<<"YES"<<endl;
    else cout<<"NO"<<endl;
}
