#include <stdio.h>

int main(){
  long a, b, v, w, t;
  scanf("%ld %ld %ld %ld %ld", &a, &v, &b, &w, &t);

  int ans = 0;
  if(a < b){
    if(a-b >= (w-v)*t)
      ans = 1;
  }else{
    if((w-v)*t <= b-a)
      ans = 1;
  }

  if(ans)  printf("YES\n");
  else     printf("NO\n");

  return 0;
}


