import math

L = raw_input().split()
A = int(L[0])
B = int(L[1])
S = A + B
P = A * B

def greatest_common_dicisor(x,y):
    if x < y:
        temp = x
        x = y
        y = temp
    
    r = x % y
    while r > 0:
        x = y
        y = r
        r = x % y
    return y
print greatest_common_dicisor(S,P)