#include<bits/stdc++.h>
using namespace std;
int main(){
    long long n;cin>>n;
    assert(n>=2&&n<=1000000000000000000);
    if(n==2)cout<<"INF"<<endl;
    else if(n<=4)cout<<6<<endl;
    else if(n<=6)cout<<4<<endl;
    else cout<<2<<endl;
}