#include <bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    if(n > 1 & n < 100){
    	cout<<"yes"<<endl;
	}
    return 0;
}

/**************************************************************
	Problem: 1641
	User: admin
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/