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

int main()
{
	int A, B, V, W, T;
	scanf("%d %d", &A, &V);
	scanf("%d %d", &B, &W);
	scanf("%d", &T);
	if (V <= W) printf("NO\n");
	else if (((long long)abs(A - B) + V - W - 1) / (V - W) <= T) printf("YES\n");
	else printf("NO\n");
	fflush(stdout);
	return 0;
}