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



	return 0;


} 

/**************************************************************
	Problem: 1641
	User: fuyijun
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/