#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>
#include <string>
#include <map>
#include <set>
#include <stack>
#include <tuple>
#include <deque>
#include <array>
#include <numeric>
#include <bitset>
#include <iomanip>
#include <cassert>
#include <chrono>
#include <random>
#include <limits>
#include <iterator>
#include <functional>
#include <sstream>
#include <fstream>
#include <complex>
#include <cstring>
#include <unordered_map>
using namespace std;

using ll = long long;
using P = pair<int, int>;
constexpr int INF = 1001001001;
constexpr int mod = 1000000007;
// constexpr int mod = 998244353;

template<class T>
inline bool chmax(T& x, T y){
    if(x < y){
        x = y;
        return true;
    }
    return false;
}
template<class T>
inline bool chmin(T& x, T y){
    if(x > y){
        x = y;
        return true;
    }
    return false;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N;
    cin >> N;
    vector<int> money;
    int k = 1;
    while((ll)k * (k + 1) / 2 <= N){
        money.emplace_back(k * (k + 1) / 2);
        if(money.back() == N){
            cout << 1 << '\n';
            return 0;
        }
        ++k;
    }
    int n = money.size();
    for(int i = 0; i < n; ++i){
        for(int j = 0; j < n; ++j){
            if(money[i] + money[j] == N){
                cout << 2 << '\n';
                return 0;
            }
        }
    }
    cout << 3 << '\n';

    return 0;
}