You are given two integers A and B. Find the largest value among A+B, A-B and A \times B.

Constraints

* -1000 \leq A,B \leq 1000
* All values in input are integers.

Input

Input is given from Standard Input in the following format:


A B


Output

Print the largest value among A+B, A-B and A \times B.

Examples

Input

3 1


Output

4


Input

4 -2


Output

6


Input

0 0


Output

0
import sys

num = raw_input().strip().split()
add = 0
minus = 0
mul = 1
cnt = 1

for n in num:
    add += int(n)
    mul *= int(n)
    if cnt == 1:
        minus = int(n)
        cnt = 0
    else:
        minus -= int(n)

print(str(max(add, minus, mul)))