"""
A, B = map(int, input().split())
if A + B > A * B:
	print("S")
elif A + B < A * B:
	print("P")
else:
	print("E")
"""

def gcd(a, b):
	if a < b:
		a, b = b, a
	if a % b == 0:
		return b
	else:
		return gcd(b, a % b)

A, B = map(int, input().split())
print(gcd(A + B, A * B))