1250F.cpp

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

#define pii pair<int, int>
#define vt vector
#define ll long long
#define pb push_back
#define all(c) (c).begin(), (c).end()
#define sz(x) (int)(x).size()
#define en '\n'

const int d4r[4] = {-1,0,1,0}; const int d4c[4] = {0,1,0,-1};
const int d8r[8] = {-1,-1,0,1,1,1,0,-1}; const int d8c[8] = {0,1,1,1,0,-1,-1,-1};
const int INF = 0x3f3f3f3f; const int mINF = 0xc0c0c0c0;
const ll LINF = 0x3f3f3f3f3f3f3f3f; const ll mLINF = 0xc0c0c0c0c0c0c0c0;
int T = 1;


void sol() {
	int n;
	cin >> n;
	int x = (int)sqrt(n);
	while(n % x) {
		x--;
	}
	cout << 2*(n/x + x) << en;

	return;
}

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

	while(T--) {
		sol();
	}

	return 0;
}