#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i=0; i<(int)(n); i++)

int black(int x, int y) {
  return __builtin_popcountll(x & y);
}

int white(int x, int y, int n) {
  x = ~x;
  y = ~y;
  int mask = (1<<n) - 1;
  return __builtin_popcountll(x & y & mask);
}

bool go(vector<int> &masks, int pos, int n) {
  if (pos == masks.size()) {
    for (int i = 0; i < masks.size(); i++) {
      for (int j = 0; j < i; j++) {
        if (black(masks[i], masks[j]) >= 2 || white(masks[i], masks[j], n) >= 2)
          return false;
      }
    }
    return true;
  }
  for (int i = 0; i < 1<<n; i++) {
    masks[pos] = i;
    if (go(masks, pos+1, n))
      return true;
  }
  return false;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  long long n;
  cin >> n;

  /*
  // 実験コード
  for (int i = 1; i < 8; i++) {
    cout << i << " ";
    vector<int> masks(i);
    if (go(masks, 0, n))
      cout << "ok" << endl;
    else
      cout << "ng" << endl;
  }
  */

  if (n <= 2)
    cout << "INF" << endl;
  else if (n <= 4)
    cout << 6 << endl;
  else if (n <= 6)
    cout << 4 << endl;
  else
    cout << 2 << endl;
  
  return 0;
}