#include <bits/stdc++.h>

using namespace std;

using int64 = long long;
const int INF = 1 << 30;

int main()
{
  int N;
  cin >> N;
  vector< int > vs;
  for(int i = 1; i * (i + 1) / 2 <= N; i++) {
    int cost = i * (i + 1) / 2;
    vs.push_back(cost);
  }

  for(auto &p : vs) {
    if(N == p) {
      cout << 1 << endl;
      return (0);
    }
  }

  for(auto &p : vs) {
    for(auto &q : vs) {
      if(N == p + q) {
        cout << 2 << endl;
        return (0);
      }
    }
  }

  cout << 3 << endl;

}