n, x = map(int,input().split())

if n % 2 == 0 and n//2 == x:
    print(3 * x)
    exit()

if x > n // 2:
    x = n - x

xx = x
yy = n - x


ans = n
i = 0

while True:
    
    if yy >= xx:
        ans += 2 * (yy // xx) * xx
        yy %= xx

        if yy == 0:
            ans -= xx
            break

        if yy < xx:
            tmp = xx
            xx = yy
            yy = tmp

print(ans)