Problem:
Score : 200 points

Problem Statement

Given are integers a,b,c and d.
If x and y are integers and a \leq x \leq b and c\leq y \leq d hold, what is the maximum possible value of x \times y?

Constraints

-10^9 \leq a \leq b \leq 10^9

-10^9 \leq c \leq d \leq 10^9

All values in input are integers.

Input

Input is given from Standard Input in the following format:

a b c d

Output

Print the answer.

Sample Input 1

1 2 1 1

Sample Output 1

2

If x = 1 and y = 1 then x \times y = 1.
If x = 2 and y = 1 then x \times y = 2.
Therefore, the answer is 2.

Sample Input 2

3 5 -4 -2

Sample Output 2

-6

The answer can be negative.

Sample Input 3

-1000000000 0 -1000000000 0

Sample Output 3

1000000000000000000

Solution in C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Linq;

namespace ABC178
{
    class Program
    {
        static void Main(string[] args)
        {
            b();
        }

        public static void b()
        {
            long[] a = Console.ReadLine().Split(' ').Select(long.Parse).ToArray();
            long b = a[0] * a[2];
            long c = a[0] * a[3];
            long d = a[1] * a[2];
            long e = a[1] * a[3];
            long m = Math.Max(b, Math.Max(c, Math.Max(d, e)));
            Console.WriteLine(m);

        }
    }
}