#include<bits/stdc++.h>
using namespace std;
int main(){
   int c;
   cin>>c;
   if(c<90){
   	cout<<"";
   } 
   if(c>90){
   	cout<<"yes";
   } 
   }
/**************************************************************
	Problem: 1301
	User: tonghuawei
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/