#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_f = (double) diff_dis / (double) diff_speed;
    long long int time = 0;
    if (time_f != (long long int) time_f) {
      time = (long long int) time_f + 1;
    }
    if (time <= t) printf("YES\n");
    else printf("NO\n");
  }

  return 0;
}
