#include <stdio.h>

int main(void) {
	int a, v, b, w, t;
	int aDis = 0, bDis = 0;

	scanf("%d", &a);
	scanf("%d", &v);
	scanf("%d", &b);
	scanf("%d", &w);
	scanf("%d", &t);

	aDis = v * t + a;
	bDis = w * t + b;

	if (aDis >= bDis) {
		puts("YES");
	}
	else {
		puts("NO");
	}

	return 0;
}