1: using System;

 2: using System.Collections.Generic;

 3: using System.Linq;

 4: // you can also use other imports, for example:

 5: // using System.Collections.Generic;

 6:  

 7: // you can write to stdout for debugging purposes, e.g.

 8: // Console.WriteLine("this is a debug message");

 9:  

 10: class Solution {

 11:     public int solution(int[] A) {

 12:         // write your code in C# 6.0 with .NET 4.5 (Mono)

 13:         

 14:         

 15:            if (A.Length<3)

 16:                 throw new ArgumentException();

 17:                 

 18:     List<int> AA = A.ToList();

 19:     AA.Sort();

 20:     long first = AA[0]*AA[1]*AA[A.Length - 1];

 21:     long second = AA[A.Length - 3]*AA[A.Length - 2]*AA[A.Length - 1];

 22:     long max = System.Math.Max(first, second);

 23:     return Convert.ToInt32(max);   

 24:     }

 25: }