import sys
input = sys.stdin.readline

def main():
	A,B = map(int, input().split())
	#N = int(input())
	#for _ in range(N):
	#	X = int(input())
	#	print("Y" if X%45<1 else "N")
	res = A+B if (A,B)!=(4,1) else 0
	print(res)
	
if __name__ == "__main__":
    main()