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: Wrong Answer)

#include<stdio.h>
int main()
{
    int a,b,c,d,e;
    while(scanf("%d%d",&a,&b)==2)
    {
        if(b!=0&&a!=0)
        {
        c=a+b;d=a-b;e=a*b;
        if(c>d&&d>e)
            printf("%d\n",c);
        else if(d>c&&c>e)
            printf("%d\n",d);
        else
            printf("%d\n",e);
        }
        else if(b==0)
            printf("%d\n",a);
            else if  (a==0&&b==0)
                printf("none\n");
         else
            printf("%d\n",b);

    }
    return 0;
}