#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define ll long long
#define ull unsigned long long

int main(){
    ll a,b,v,w,t;
    ull dist;
    scanf("%lld%lld",&a,&v);
    scanf("%lld%lld",&b,&w);
    scanf("%lld",&t);
    if (a>=b) dist=a-b;
    else dist=b-a;
    if (w>=v) printf("NO");
    else{
        if (t*(v-w)>=dist) printf("YES");
        else printf("NO");
    }
    return 0;
}
