#include<stdio.h>
#include<stdlib.h>
int main(void){
  long long a,v,b,w,t;
  scanf("%lld%lld%lld%lld%lld",&a,&v,&b,&w,&t);
  int diff;
  diff=abs(b-a);
  if(diff+(w*t-v*t)>0){
    printf("NO\n");
  }else{
    printf("YES\n");
  }
  return 0;
}
