using System;

public class Program

{

    public static void Main()

    {

        DateTime? firstCirculation = new DateTime(2017, 10,7);

        DateTime? nextInspection = new DateTime(2021,2,7);

        if(nextInspection.HasValue){

            if(nextInspection.Value <= DateTime.Now.AddDays(92)){

                Console.WriteLine(nextInspection.Value.ToString("d") + " work (" + DateTime.Now.AddDays(92).ToString("d") +")");

            } else {

                Console.WriteLine(nextInspection.Value.ToString("d") + " not work");

            }

        }

        if(firstCirculation.HasValue){

            if(firstCirculation.Value.AddYears(3).AddMonths(8) < DateTime.Now ){

                Console.WriteLine(firstCirculation.Value.ToString("d") + " > 3 ans et 8 mois (" + firstCirculation.Value.AddYears(3).AddMonths(8).ToString("d") + ") work");

            } else {

                Console.WriteLine(firstCirculation.Value.ToString("d") + " < 3 ans et 8 mois (" + firstCirculation.Value.AddYears(3).AddMonths(8).ToString("d") + ") not work");

            }

            if(firstCirculation.Value.AddYears(4) < DateTime.Now ){

                Console.WriteLine(firstCirculation.Value.ToString("d") + " > 4 ans (" + firstCirculation.Value.AddYears(4).ToString("d") + ") work");

            } else {

                Console.WriteLine(firstCirculation.Value.ToString("d") + " < 4 ans (" + firstCirculation.Value.AddYears(4).ToString("d") + ") not work");

            }

        }

    }

}