#include <iostream>
#include <vector>

using namespace std;

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

	vector<int> coins;

	int k = 1;
	while (1) {
		auto val = k * (k + 1) / 2;
		if (val > n) {
			break;
		}
		coins.emplace_back(val);
		k++;
	}

	int ans = 3;
	for (int i = 0; i < coins.size(); i++) {
		if (coins[i] == n) {
			ans = 1;
			break;
		}
		for (int j = i; j < coins.size(); j++) {
			if (coins[i] + coins[j] == n) {
				ans = min(ans, 2);
			}
		}
	}
	cout << ans << endl;
	return 0;
}