#include<stdio.h>
#include<stdlib.h>
int main(){
  long int A,V,B,W,T;
  scanf("%ld",&A);
  scanf("%ld",&V);
  scanf("%ld",&B);
  scanf("%ld",&W);
  scanf("%ld",&T);
  
  if(abs(A-B) <= (V-W)*T){
  	printf("YES");
  }else{
    printf("NO");
  }
  
  return 0;
}