Problem:
Score : 100 points

Problem Statement

We have two integers: A and B.

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

Constraints

All values in input are integers.

-100 \leq A,\ B \leq 100

Input

Input is given from Standard Input in the following format:

A B

Output

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

Sample Input 1

-13 3

Sample Output 1

-10

The largest number among A + B = -10, A - B = -16, and A \times B = -39 is -10.

Sample Input 2

1 -33

Sample Output 2

34

The largest number among A + B = -32, A - B = 34, and A \times B = -33 is 34.

Sample Input 3

13 3

Sample Output 3

39

The largest number among A + B = 16, A - B = 10, and A \times B = 39 is 39.

Solution in C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <memory.h>
#include <math.h>

#define MAX(a, b) (((a) > (b)) ? (a) : (b))
#define MIN(a, b) (((a) > (b)) ? (b) : (a))
#define SWAP(t, a, b) do{t c = a; a = b; b = c;}while(0)

int main (int argc, char **argv)
{
  int64_t a = 0;
  int64_t b = 0;

  scanf("%lld %lld", &a, &b);

  printf("%lld\n", MAX(a + b, MAX(a - b, a * b)));

  return 0;
}