#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<P,int> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-8;
const ll mod=1e9+7;
const int dx[4]={-1,0,1,0},dy[4]={0,-1,0,1};

int n;

int main(){
	cin>>n;
	vi a;
	for(int i=1;;i++){
		int A=i*(i+1)/2;
		if(A>n) break;
		a.push_back(A);
	}
	if(a.back()==n) cout<<1<<endl;
	else{
		for(int i=0;i<a.size();i++){
			auto it=lower_bound(a.begin(),a.end(),n-a[i]);
			if(it!=a.end()&&*it+a[i]==n){
				cout<<2<<endl;
				return 0;
			}
		}
		cout<<3<<endl;
	}
}