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

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

	return 0;
}