#include <bits/stdc++.h>
using namespace std;

using int64 = long long;
using uint64 = unsigned long long;

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

    int N;
    cin >> N;

    vector<int> triangularNumbers;
    for (int n = 1, tri = 1; tri <= N; n++, tri = n * (n + 1) / 2)
    {
        if (tri == N)
        {
            cout << 1 << endl;
            return 0;
        }
        triangularNumbers.push_back(tri);
    }

    int m = triangularNumbers.size();
    for (int i = 0; i < m; i++)
    {
        for (int j = i; j < m; j++)
        {
            int sum = triangularNumbers[i] + triangularNumbers[j];

            if (sum == N)
            {
                cout << 2 << endl;
                return 0;
            }
        }
    }
    cout << 3 << endl;

    return 0;
}