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

int main(void) {
  long long int a, b, v, w, t;
  scanf("%lld %lld %lld %lld %lld", &a, &v, &b, &w, &t);
  long long int diff_dis = b - a, diff_speed = v - w;
  if (diff_speed <= 0) printf("NO\n");
  else if ((diff_dis / diff_speed) <= t) printf("YES\n");
  else printf("NO\n");

  return 0;
}
