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

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

xx = x
yy = n - x

ans = n
i = 0

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

    if yy == 0:
        ans -= xx
        break

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

print(ans)
