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

int main()
{
	long long int a, v;
	long long int b, w;
	long long int t;
	long long int sd, pd;
	int d = 1;
	int flag = 0;

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

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

	if (a > b)
		d = -1;

	a += v * t * d;

	b += w * t * d;

	if (d == -1) {
		if (a <= b)
			flag = 1;
	}
	else if (d == 1)
		if (a >= b)
			flag = 1;

	if (flag==1)
		printf("YES\n");
	else
		printf("NO\n");

	return 0;
}