#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n<100){
		if(n>1){
			cout<<"yes";
		}
	}
}
/**************************************************************
	Problem: 1641
	User: linzihang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/