#include<stdio.h>
#include<stdlib.h>
#include<math.h>

int main() {
	long long a, b, v, w, t;
	scanf("%lld%lld\n", &a, &v);
	scanf("%lld%lld\n", &b, &w);
	scanf("%lld", &t);
	if (w >= v) {
		printf("NO");
		return 0;
	}
	if (abs(b - a) / (double)(v - w) <= t) printf("YES");
	else printf("NO");

	return 0;
}