a,b=map(int,input().split())
add=a+b
mul=a*b
if mul<add:
    add,mul=mul,add
    
def gcd(add,mul):
    
    r=add%mul
    while True:
        add,mul=mul,r
        r=add%mul
        if r==0:
            return mul
            break
print(gcd(a,b))