#include<stdio.h>
#include<stdlib.h>
#define ll long long
int main(){
    ll a, b, v, w, t;
    scanf("%lld%lld%lld%lld%lld",&a,&v,&b,&w,&t);
    ll d = abs(a - b);
    ll dd = (v - w ) * t;
    puts(d <= dd ? "YES" : "NO");
    return 0;
}