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

#define RAND(min,max) (rand()%(max-min+1)+min)
#define DEBUG(void) {printf("\nDEBUG %d\n",num_debug);num_debug++;}
char num_debug = 0;

int main(void) {
	srand((unsigned)time(NULL));

	int Array[5];
	for (int i = 0; i < 5; i++)
		scanf("%d", &Array[i]);

	if (abs(Array[0] - Array[2]) <= (Array[4] * (Array[1] - Array[3])))
		printf("YES");
	else
		printf("NO");

	return 0;
}