using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(SetBitsInByte(new byte[] { 0, 1, 5, 6 }));

    }

    public static byte SetBitsInByte(byte[] bitNumbering) {

        var result = 0;

        foreach(var bit in bitNumbering) {

            result = result | (1 << bit);

        }       

        return (byte) result;

    }

}