#include<cstdio>
#include<cstring>
#include<vector>
#include<queue>
#include<stack>
#include<algorithm>
#include<cmath>
#include<climits>
#include<string>
#include<set>
#include<unordered_set>
#include<numeric>
#include<map>
#include<iostream>
using namespace std;
#define rep(i,n) for(int i = 0;i<((int)(n));i++)
#define reg(i,a,b) for(int i = ((int)(a));i<=((int)(b));i++)
#define irep(i,n) for(int i = ((int)(n)-1);i>=0;i--)
#define ireg(i,a,b) for(int i = ((int)(b));i>=((int)(a));i--)
typedef long long ll;
typedef pair<ll, ll> mp;
ll mod = 1e9+7;
ll inf = 1e18;

//AC

int main(void){
	ll n,ans=0;
	cin>>n;
	vector<ll> v;
	reg(i,1,1e9){
		if(i*(i+1)/2>n)break;
		if(i*(i+1)/2==n){
			ans=1;
			break;
		}
		v.push_back(i*(i+1)/2);
	}
	if(ans==0){
		//全ての組み合わせを作る．
		unordered_set<ll> s;
		rep(i,v.size()){
			rep(j,i+1){
				s.insert(v[i]+v[j]);
			}
		}
		if(s.count(n)>0){
			ans=2;
		}else{
			ans=3;
		}
	}
	cout<<ans<<endl;
	return 0;
}