#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    vector<int> a;
    for (int i = 1; i * (i + 1) / 2 <= n; i++) {
        a.push_back(i * (i + 1) / 2);
        if (a.back() == n) {
            cout << 1 << endl;
            return 0;
        }
    }
    for (int x : a) {
        for (int y : a) {
            if (x + y == n) {
                cout << 2 << endl;
                return 0;
            }
        }
    }
    cout << 3 << endl;
    return 0;
}