#include<bits/stdc++.h>
using namespace std;
using LL=long long;
using ULL=unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main(){
  ULL N; scanf("%llu",&N);
  if(N<=2) printf("INF\n");
  else if(N<=4) printf("6\n");
  else if(N<=6) printf("4\n");
  else printf("2\n");
  return 0;
}