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)))

-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)))