using System;

public class Program

{

    public static void Main()

    {

string [, ,] timetables = new string [2, 3, 3];

//Student 1 

timetables [0,0,0] = "French"; 

timetables [0,0,1] = "German";

timetables [0,0,2] = "History";

timetables [0,1,0] = "Geography";

timetables [0,1,1] = "History"; 

timetables [0,1,2] = "IT"; 

timetables [0,2,0] = "Computer Science"; 

timetables [0,2,1] = "English"; 

timetables [0,2,2] = "History"; 

//Student 2 

timetables [1,0,0] = "IT"; 

timetables [1,0,1] = "Spanish"; 

timetables [1,0,2] = "English"; 

timetables [1,1,0] = "Food Technology"; 

timetables [1,1,1] = "History"; 

timetables [1,1,2] = "French"; 

timetables [1,2,0] = "Computer Science"; 

timetables [1,2,1] = "Geography"; 

timetables [1,2,2] = "French";

Console.WriteLine("Enter student id (0 or 1)");

string Id = Console.ReadLine();

int studentId = Convert.ToInt32(Id);

Console.WriteLine("Enter Period Number (0, 1, or 2): ");

string period  = Console.ReadLine();

int Period = Convert.ToInt32(Id);

Console.WriteLine("Enter Day of the Week (0, 1, or 2): ");

string day  = Console.ReadLine();

int Day  = Convert.ToInt32(Id);

if (studentId < 0 || studentId > 1 || Period < 0 || Period > 2 || Day < 0 || Day > 2)

 {

Console.WriteLine("Invalid input. Please ensure all inputs are within the correct range.");

 }

 else{

string subject = timetables[studentId, Period, Day];

Console.WriteLine("The subject for Student " + studentId + 1 + " on Period " + Period + 1 + ", Day " + Day + 1 + " is: " + subject);

 }

    }

}

​