#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define MOD 1000000007
#define INF 1000000000000000000
#define PI 3.14159265359
#define ll long long
#define ull unsigned long long
#define MYPOW_t int

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>=dist/(v-w-1)) printf("YES");
        else printf("NO");
    }
    return 0;
}
