#include <iostream>
#include <fstream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <algorithm>
using namespace std;

#define REP(i,n) for(int i=0; i<n; ++i)
#define FOR(i,a,b) for(int i=a; i<=b; ++i)
#define FORR(i,a,b) for (int i=a; i>=b; --i)
#define ALL(c) (c).begin(), (c).end()

typedef long long ll;
typedef vector<int> VI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef vector<VI> VVI;
typedef pair<int,int> P;
typedef pair<ll,ll> PL;

int main() {
    int n;
    cin >> n;
    VI tri;

    FOR(i,1,100000){
        int x = i * (i+1) / 2;
        if (x > n) break;
        tri.push_back(x);
        if (x == n){
            cout << 1 << endl;
            return 0;
        }
    }

    for (int x : tri) for (int y : tri){
        if (x + y == n){
            cout << 2 << endl;
            return 0;
        }
    }
    cout << 3 << endl;
    return 0;
}