lost_rectangle

#include<iostream>
#include<cmath>

#define long long long
#define nln '\n'

using namespace std;

int main()
{
    long are;
    cin >> are;

    long miv = LLONG_MAX;
    for (long i = round(sqrt(are)); i >= 1; --i)
        if (are % i == 0 && 2*(i + are/i) < miv)
            miv = 2*(i + are/i);

    cout << miv << nln;
    return 0;
}