a, b = list(map(int, input().split()))

print((max([a + b, a - b, a * b])))
a,b=list(map(int,input().split()))

print((max(a+b,a-b,a*b)))
a, b = list(map(int, input().split()))
print((max([a + b, a - b, a * b])))

a, b = list(map(int, input().split()))
print((max(a + b, a - b, a * b)))

-print((max([a + b, a - b, a * b]))) +print((max(a + b, a - b, a * b)))