#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 {
    double time_d = (double) diff_dis / (double) diff_speed;
    long long int time = (long long int) time_d;
    if (time_d == time && time <= t) {
      printf("YES\n");
    } else {
      if (time + 1 <= t) printf("YES\n");
      else printf("NO\n");
    }
  }

  return 0;
}
