using System;

public class Program

{

    public static void Main()

    {

        //Full Range

        DateTime startDate = new DateTime(2020,12,16);

        DateTime endDate = new DateTime(2021,03,16);

        int test = (endDate - startDate).Days;

        Console.WriteLine(test.ToString());

        Console.WriteLine("----------------------------");

        // Partial Ranges

        startDate = new DateTime(2020,12,16);

        endDate = new DateTime(2020,12,31);

        int test1 = (endDate - startDate).Days;

        Console.WriteLine(test1.ToString());

        startDate = new DateTime(2021,1,1);

        endDate = new DateTime(2021,1,31);

        int test2 = (endDate - startDate).Days;

        Console.WriteLine(test2.ToString());

        startDate = new DateTime(2021,2,1);

        endDate = new DateTime(2021,2,28);

        int test3 = (endDate - startDate).Days;

        Console.WriteLine(test3.ToString());

        startDate = new DateTime(2021,3,1);

        endDate = new DateTime(2021,3,16);

        int test4 = (endDate - startDate).Days;

        Console.WriteLine(test4.ToString());

        Console.WriteLine("----------------------------");

        // Summary

        Console.WriteLine(test1 + test2 + test3 + test4);

    }

}