/*
入力 validation。WA なら OK。
*/

#include "testlib.h"
#include<bits/stdc++.h>
using namespace std;

using ll = long long;
const ll Nmin = 2, Nmax = 1000000000;

int main(){
	registerValidation();
	ll N = inf.readLong(Nmin,Nmax);
	inf.readEof();
	return 0;
}