typedef char Bool;
#define true 39
#define false 0 
typedef long long int64;
typedef unsigned long long uint64;
typedef int int32;
typedef unsigned int uint32;
typedef unsigned char byte;
#pragma warning(disable:4996)
#include <stdio.h>
#include <stdlib.h>

#define absolute(v) (v < 0) ? v * (-1) : v;

int main()
{
	int32 a, b;
	int32 v, w;
	int32 t;
	scanf("%d %d ", &a, &v);
	scanf("%d %d", &b, &w);
	scanf("%d", &t);
	
	int32 c = a - b;
	int32 x = absolute(w - v);

	if (a < b)
	{
		printf("NO");
		exit(0);
	}

	if (x == 0) 
	{
		printf("NO");
		return 0;
	}

	float d = (float)c / (float)x;

	(d >= t) ? printf("NO") : printf("YES");

	return 0;
}