from math import sqrt

inp = open('input.txt')
data = int(inp.readline())
inp.close()

result = 0
multiplied = []
for x in range(1, int(sqrt(data) + 1)):
    if not (data % x):
        multiplied.append([x, data//x])
results = []
for mult in multiplied:
    m1 = mult[0]
    m2 = mult[1]
    last_line = int(
        ((m1 + m2) * 2) + (m1 - 1) * m2 + (m2 - 1) * m1
    )
    connect_line = int(
        (m1 + 1) * (m2 + 1)
    )
    results.append((last_line * 2) + connect_line)
result = str(min(results))

out = open('output.txt', 'w')
out.write(result)
out.close()