def gcd(a, b):
    r = a % b
    if r:
        return gcd(b, r)
    else:
        return b
print gcd(13, 6)

def lcm(a, b):
    return a * b / gcd(a, b)
print lcm(12, 6)

def lcmAll(seq):
    return reduce(lcm, seq)


lis = [a for a in range(1, 11)]
print lcmAll(lis)