#include<stdio.h>

int main (void)
{
  long long int a,b,v,w,t;
  
  scanf("%lld %lld %lld %lld %lld", &a,&v,&b,&w,&t);
  
  if(a<b){
    if(a+v*t >= b+w*t)
      printf("YES");
    else
      printf("NO");
  }else{
    if(a+v*t*-1 <= b+w*t*-1 && b<a)
        printf("YES");
    else
        printf("NO");
  }
  
  return 0;
}
