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,max(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, max(a - b, a * b))))

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