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

#define REP(i, n) for(int i = 0; i < (n); i++)
using ll = long long;

int main(){
    ll X;
    cin >> X;
    vector<ll> A{2, 2, -1, -1, 2, -1, -1};
    ll cnt = 0;
    ll pos = 0;
    REP(i, 100){
        for(auto a: A){
            cnt += abs(a);
            pos += a;
            if(pos == X){
                cout << cnt << endl;
                return 0;
            }
        }
    }
}