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

int main()
{
	int a, v;
	int b, w;
	int t;
	int sd, pd;

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

	sd = (v - w) * t;
	pd = abs(a - b);

	if (sd >= pd)
		printf("YES\n");
	else
		printf("NO\n");

	return 0;
}