#include <iostream>
#include <set>
using namespace std;

int main() {
    int N;
    cin >> N;

    set<int> triangularNumbers;
    for (int k = 1; k * (k + 1) / 2 <= N; k++) {
        triangularNumbers.insert(k * (k + 1) / 2);
    }
    // 三角数定理よりNはたかだか3つの整数の和で表すことができる
    int answer = 3;
    if (triangularNumbers.count(N) > 0) {
        answer = 1;
    } else {
        for (int n : triangularNumbers) {
            if (triangularNumbers.count(N - n) > 0) {
                answer = 2;
                break;
            }
        }
    }
    cout << answer << endl;

    return 0;
}