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