using System;

public class Program

{

    public static void Main()

    {

            int num;

            string[,] var1, var23, var34, var45;

            var1 = new string[6,8];

            var23 = new string[40,80];

            var34 = new string[40,80];

            var45 = new string[40,80];

            Console.WriteLine("De cuantos alumnos se calculara el promedio");

            num = Int32.Parse(Console.ReadLine());

            for (int fila = 0; fila < num; fila++)

            {

                for (int cl = 0; cl < 5; cl++)

                {

                    switch(cl)

                    {

                        case 0:

                            Console.WriteLine("Ingresar nombre");

                            var1[fila, cl] = Console.ReadLine();

                            break;

                        case 1:

                            int na, na2, na3;

                            Console.WriteLine("Ingrese su primera nota");

                            na = Int32.Parse(Console.ReadLine());

                            string numString = "" + na;

                            var1[fila, cl] = (numString);

                            var23[0,0] = var1[fila, cl];

                            break;  

                        case 2: 

                            Console.WriteLine("Ingrese su segunda nota");

                            na2 = Int32.Parse(Console.ReadLine());

                            string numString2 = "" + na2;

                            var1[fila, cl] =(numString2);

                            var34[0,0] = var1[fila, cl];

                            break;  

                        case 3: 

                            Console.WriteLine("Ingrese su tercera nota");

                            na3 = Int32.Parse(Console.ReadLine());

                            string numString3 = "" + na3;

                            var1[fila, cl] =(numString3);

                            var45[0,0] = var1[fila, cl];

                            break;  

                        case 4: 

                            int au1,au2,au3,suma;

                            au1= Int32.Parse(var23[0,0]);

                            au2= Int32.Parse(var34[0,0]);

                            au3= Int32.Parse(var45[0,0]);

                            suma= ((au1+au2+au3)/3);

                            string sumString = "" + suma;

                            var1[fila, cl] = (sumString);

                            break;

                        default:break;

                    }

                }

            }

            Console.WriteLine("la/s nota/s:");

            for (int fila = 0; fila < num; fila++)

            {

                for (int cl = 0; cl < 5; cl++)

                {

                    Console.Write(" "+var1[fila,cl]); 

                }

                Console.WriteLine("");

            }

    }}