#include <bits/stdc++.h>
using namespace std;
int main(){
	int a;
	cin>>a;
	if (a>1&&a<100) cout<<"yes";
	 
	
	
	
	
	
	

	
	
}










 
/**************************************************************
	Problem: 1641
	User: zhuangwenya
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/