using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        string [] branches = {"010088","027006","010720"};

         var tupleArray = new (string company, string branch)[]

        {

            ("01", "0088"),

            ("01", "0720"),

            ("01", "0001"),

            ("02", "7006")

        };

        var filtered = tupleArray.Where(t => branches.Contains(t.company+t.branch) );

        Console.WriteLine( filtered.Count() );

    }

}