#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
int n, res = 3;
map<int, bool> vis;

signed main()
{

    // freopen("coin.in", "r", stdin);
    // freopen("coin.out", "w", stdout);
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n;
    for (int i = 1; i * (i + 1) / 2 <= n; i++)
    {
        if (i * (i + 1) / 2 == n)
        {
            res = 1;
            break;
        }
        vis[i * (i + 1) / 2] = 1;
        if (vis.count(n - i * (i + 1) / 2))
        {
            res = min(res, 2ll);
        }
    }
    cout << res;
}