#include<stdio.h>
signed main(){
  int a,v,b,w,t;
  scanf("%d %d %d",&a,&v,&b);
  scanf("%d %d",&w,&t);
  if(a!=b && v*t+a>=w*t+b){
    printf("YES\n");
  }else{
    printf("NO\n");
  }
  return(0);
}