using System;
public class Exercise28
{
    public static void Main()
    {
        int i,j;
        int[,] arr1 = new int[10,10];
        int det=0;
        Console.Write("\n\nCalculate the determinant of a 3 x 3 matrix :\n");
        Console.Write("-------------------------------------------------\n");
        Console.Write("Input elements in the matrix :\n");
        for(i=0; i<3; i++)
            {
                for(j=0; j<3; j++)
                    {
                        Console.Write("element - [{0}],[{1}] : ",i,j);
                        arr1[i,j] = Convert.ToInt32(Console.ReadLine());
                    }
            }
        Console.Write("The matrix is :\n");
        for(i=0; i<3; i++)
            {
                for(j=0; j<3 ; j++)
                    Console.Write("{0}  ",arr1[i,j]);
                Console.Write("\n");
            }
        for(i=0; i<3; i++)
            det = det + (arr1[0,i]*(arr1[1,(i+1)%3]*arr1[2,(i+2)%3] - arr1[1,(i+2)%3]*arr1[2,(i+1)%3]));
        Console.Write("\nThe Determinant of the matrix is: {0}\n\n",det);
    }
}