#include <bits/stdc++.h>
using namespace std;

#define rep(i,a,b) for(int i=a;i<b;i++)
typedef long long ll;
const ll inf = 100100100100100;
const int mod = 1e9+7;

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

    int n;
    cin >> n;
    vector<int> arr;

    int i = 1;
    while(i*(i+1)/2 <= n){
        arr.push_back(i*(i+1)/2);
        i++;
    }

    if(binary_search(arr.begin(), arr.end(), n)){
        cout << 1 << endl;
        return 0;
    }

    rep(i,0,arr.size()){
        if(binary_search(arr.begin(), arr.end(), n - arr[i])){
            cout << 2 << endl;
            return 0;
        }
    }

    cout << 3 << endl;

}