NextDate

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NextDate
{
    class NextDate
    {
        static void Main(string[] args)
        {
            byte day = byte.Parse(Console.ReadLine());
            byte month = byte.Parse(Console.ReadLine());
            ushort year = ushort.Parse(Console.ReadLine());
            bool intercalary = false;
            // If year is intercalary
            if (year % 4 == 0)
            {
                intercalary = true;
            }
            else
            {
                intercalary = false;
            }
            switch (month)
            {
                //February
                case 2:
                    if (intercalary == true)
                    {
                        if (day < 29)
                        {
                            day++;
                        }
                        else
                        {
                            day = 1;
                            month++;
                        }
                    }
                    else
                    {
                        if (day < 28)
                        {
                            day++;
                        }
                        else
                        {
                            day = 1;
                            month++;
                        }
                    }
                    break;
                //April, June, September, November
                case 4:
                case 6:
                case 9:
                case 11:
                    if (day < 30)
                    {
                        day++;
                    }
                    else
                    {
                        day = 1;
                        month++;
                    }
                    break;
                // January, March, May, July, August, October
                case 1:
                case 3:
                case 5:
                case 7:
                case 8:
                case 10:
                    if (day < 31)
                    {
                        day++;
                    }
                    else
                    {
                        day = 1;
                        month++;
                    }
                    break;
                //December
                case 12:
                    if (day < 31)
                    {
                        day++;
                    }
                    else
                    {
                        day = 1;
                        month = 1;
                        year++;
                    }
                    break;
            }
            Console.WriteLine("{0}.{1}.{2}", day, month, year);
        }
    }
}