using System;

​

public class Program

{

    public static bool IsExist(int[] arr, int n)

    {

        for (int i = 0; i < arr.Length; i++)

        {

            if (arr[i] == n)

            {

                return true;

            }

        }

        return false;

    }

​

    public static bool AllIncluded(int[] a, int[] b)

    {

        for (int i = 0; i < b.Length; i++)

        {

            if (IsExist(a, b[i]) == false)

            {

                return false;

            }

        }

        return true;

    }

​

    public static void Main()

    {

        int[] a = {20, 3, 10, 5, 11, 35, 15, 2};

        int[] b = {8, 7, 17};

        int[] c = {58,12, 3, 69};

​

        Console.WriteLine(AllIncluded(a, b));

        Console.WriteLine(AllIncluded(a, c));

        Console.WriteLine(IsExist(a, 6));

        Console.WriteLine(IsExist(a, 23));

    }

}