#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: lzc
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2072 kb
****************************************************************/