using System;

public class Program

{

    public static void Main(string[] ags)

    {

        pationt st=new pationt();

        Console.WriteLine("enter pationt id");

        var ID=Console.ReadLine();

        Console.WriteLine("enter pationt arrivaltime");

        st.arrivaltime=Convert.ToDateTime(Console.ReadLine());

        Console.WriteLine("enter pationt discharge");

        st.discharge=Convert.ToDateTime(Console.ReadLine());

        Console.WriteLine(st.staytime=st.discharge.Subtract(st.arrivaltime));

    }

    public class pationt

    {

        public int ID;

        public DateTime arrivaltime;

        public DateTime discharge;

        public TimeSpan staytime;

    }

}