#include<bits/stdc++.h>
using namespace std;
int main(){
  int n;
  cin>>n;
  if(n>=90) cout<<"yes";
  else cout<<" ";
    return 0;
}
/**************************************************************
	Problem: 1301
	User: wangyousi
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/