#include <stdio.h>

int main()
{
	long long a, v, b, w, t;
	scanf ("%lld %lld %lld %lld %lld", &a, &v, &b, &w, &t);
	long long d = a - b;
	if (d < 0) d = -d;
	puts(t * (v - w) >= d ? "YES" : "NO");

	return 0;
}