import math

X, Y = map(int, input().split())

res = int(math.sqrt(X * X + Y * Y))

for i in range(100):
    if res + i / 2 > math.sqrt(X * X + Y * Y):
        print(int(2 * (res + i / 2)))
        break
    if res + i > math.sqrt(X * X + Y * Y):
        print(2 * (res + i))
        break