#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

int main(){
  int N;
  cin >> N;

  vector<int> v;
  {
    int k = 1;
    while(true){
      ll x = k * (ll)(k+1) / 2;
      v.push_back(x);
      if(x > N) break;
      k++;
    }
  }
  rep(i,v.size()){
    if(N == v[i]){
      cout << 1 << endl;
      return 0;
    }
  }

  rep(i,v.size()){
    rep(j,v.size()){
      if(N == v[i] + v[j]){
        cout << 2 << endl;
        return 0;
      }
    }
  }
  
  cout << 3 << endl;
  
  return 0;
}