#include "bits/stdc++.h"
#define REP(i,n,N) for(ll i=(n); i<(N); i++)
#define RREP(i,n,N) for(ll i=(N-1); i>=n; i--)
#define CK(n,a,b) ((a)<=(n)&&(n)<(b))
#define ALL(v) (v).begin(),(v).end()
#define p(s) cout<<(s)<<endl
#define p2(a,b) cout<<(a)<<" "<<(b)<<endl
#define v2(T) vector<vector<T>>
typedef long long ll;
using namespace std;
const ll mod = 1e9+7;


int main() {
    int N; cin>>N;
    unordered_map<int,bool> mp;
    for(int k=1;k*(k+1)<=2*N;k++){
        if(k*(k+1)/2==N) {
            p(1);
            return 0;
        }
        mp[k*(k+1)/2]=1;
    }
    for(auto m:mp) {
        if(mp[N-m.first]){
            p(2);
            return 0;
        }
    }
    p(3);


    return 0;
}