using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        //var guid = ZiezoClient.GetId(input.BirthDate1, input.BirthDate2, etc);

        var guid = ZiezoClient.GetId(input.GetChildBirthDate(1), input.GetChildBirthDate(2));

    }

    public class Input {

        public DateTime?[] ChildBirthDates;

        public DateTime? GetChildBirthDate(int index) {

            return ChildBirthDates.ElementAtOrDefault(index);

        }

    }

}