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

int main(void)
{
  long int a,b;
  long int v,w;
  long int t;
  long int x,y;

  scanf("%ld %ld",&a,&v);
  scanf("%ld %ld",&b,&w);
  scanf("%ld",&t);

  x = a - b;
  if(x<0) x *= -1;

  y = v - w;

  if(y<=0)
  {
    printf("NO\n");
    return 0;
  }

  if(x/y<t || (x/y==t && x%y==0))
  {
    printf("YES\n");
  }
  else
  {
    printf("NO\n");
  }

  return 0;
}