#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const int INF = (1 << 30) - 1;
const ll INF64 = ((ll)1 << 62) - 1;
const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int solve(ll n) {
	vector<ll> a;
	map<ll, bool> mp;
	for (int i = 1; i * (i + 1) / 2 <= n; i++) {
		if (n == i * (i + 1) / 2) {
			return 1;
		}
		a.emplace_back(i * (i + 1) / 2);
		mp[i * (i + 1) / 2] = true;
	}

	for (auto v : a) {
		if (mp[n - v]) {
			return 2;
		}
	}

	return 3;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	ll n;
	cin >> n;

	cout << solve(n) << endl;
	return 0;
}