using System;

public class Program

{

    public static void Main()

    {

        int a=9, m=3, d=1;

        int x = a/4 - a/100 + a/400 - EsBisiesto(a);

        int n=(a+x) % 7;

        int y= (n + 31+29+1 )%7;

        Console.WriteLine("Hello World {0} {1} {2} {3} {4}",x,a%7,x%7, QueDiaEs(n), QueDiaEs(y));

    }

    public static string QueDiaEs(int n)

    {

    string dia="n/a";

    switch(n)

    {

        case 1: dia = "Lunes"; break;

        case 2: dia = "Martes"; break;

        case 3: dia = "Miercoles"; break;

        case 4: dia = "Jueves"; break;

        case 5: dia = "Viernes"; break;

        case 6: dia = "Sábado"; break;

        case 7: dia = "Domingo"; break;

    }

    return dia;

    }

    public static int EsBisiesto(int a)

    {

      int bisiesto=0;

      if(a % 4 == 0)

          if(a % 100 == 0) {

            if(a % 400 == 0)

                bisiesto = 1;

            }

          else

            bisiesto = 1;

     return bisiesto;

    }

}

​

​

​

/*

using System;

public class Program

{

    public static void Main()

    {

        int a=2016, m=2, d=29;

        int x = a/4 - a/100 + a/400 ;

        int n=(a+x) % 7;

        int y= (n + 31+d-1 )%7;

        Console.WriteLine("Hello World {0} {1} {2} {3} {4}",x,a%7,x%7, QueDiaEs(n), QueDiaEs(y));

    }

    public static string QueDiaEs(int n)

    {

    string dia="n/a";

    switch(n)

    {

        case 1: dia = "Lunes"; break;

        case 2: dia = "Martes"; break;

        case 3: dia = "Miercoles"; break;

        case 4: dia = "Jueves"; break;

        case 5: dia = "Viernes"; break;

        case 6: dia = "Sábado"; break;

        case 7: dia = "Domingo"; break;

    }

    return dia;

    }

}

*/