#!/bin/env python3
from math import sqrt
n = int(input())
s = int(sqrt(n))+1
ans = 1000000000
for a in range(1, s):
    for b in range(1, s):
        if n % (a*b) == 0:
            c = n//a//b
            ans = min(ans, 2*(a*b+b*c+c*a))
print(ans)