#include <bits/stdc++.h>
using namespace std;
int main(){
  long long N;
  cin >> N;
  if (N == 2){
    cout << "INF" << endl;
  } else if (N == 3){
    cout << 6 << endl;
  } else if (N == 4){
    cout << 5 << endl;
  } else if (N <= 6){
    cout << 4 << endl;
  } else {
    cout << 3 << endl;
  }
}