//#include <atcoder/all>
#include <bits/stdc++.h>
#include <cmath>
using namespace std;
//using namespace atcoder;
using ll = long long;
#define all(A) A.begin(),A.end()
using vll = vector<ll>;
#define rep(i, n) for (long long i = 0; i < (long long)(n); i++)
using Graph = vector<vector<ll>>;

int main() {
	ll N;cin>>N;
	if(N==2)cout<<"INF"<<endl;
	else if(N<=4)cout<<6<<endl;
	else if(N<=6)cout<<4<<endl;
	else{
		cout<<2<<endl;
	}
}