#include <bits/stdc++.h>
using namespace std;

bool is_tri(int n) {
  int sn = sqrt(n * 2) + 1e-9;
  return sn * (sn + 1) / 2 == n;
}

signed main() {
  ios::sync_with_stdio(false);
  int N;
  cin >> N;
  int ans = 3;
  if (is_tri(N)) {
    ans = 1;
  } else {
    for (int i = 1; ; ++i) {
      int x = i * (i + 1) / 2;
      if (x > N) break;
      if (is_tri(N - x)) {
        ans = 2;
        break;
      }
    }
  }
  cout << ans << endl;
  return 0;
}