#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<stdint.h>
#include<tgmath.h>
#include<stdbool.h>
#include<sys/queue.h>
#include<time.h>
#define ll long long
#define min(a, b) ((a) > (b) ? (b) : (a))
#define max(a, b) ((a) > (b) ? (a) : (b))

ll a, b, v, w, t;

int main(){
    scanf("%lld%lld%lld%lld%lld", &a, &v, &b, &w, &t);
    a = llabs(a - b);
    v -= w;
    if(v<=0){
        puts("NO");
        return 0;
    }
    if(0 < a/v && (a+v-1)/v <= t){
        puts("YES");
        return 0;
    }
    puts("NO");
    return 0;
}
