using System;

​

public class Program

{

    public static void Main()

    {

        var array = new int[] { 0, int.MinValue, int.MaxValue, 13 };

        int s = 0;

        foreach (var a in array)

        {

            s += GetNumberOfZeroBits(a);

        }

​

        Console.WriteLine(s);

    }

    public static int GetNumberOfZeroBits(int n)

    {

        int s = 0;

        for (int i = 0; i < 32; i++)

        {

            if ((n & (1 << i)) == 0) s++;

        }

        return s;

    }

}