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