using System;

public class Program

{

    public static void Main()

    {

        int lnvalor;

            int []arrvalores = new int[5];

        string lsconcatenacion;

            lsconcatenacion = "";

            for (int lnI=0;lnI<10;lnI++)

            {

                do

                {

        Console.WriteLine("Dame el valor {0}[20...80]:", (lnI +1));

                    lnvalor = Convert.ToInt16(Console.ReadLine());

                }while (lnvalor<20) || (lnvalor>80);

                lsconcatenacion+=Convert.ToString(lnvalor);

            }

    }

}