C# 14/02/23

using System;

namespace Task01
{
    class Program
    {
        static void Main(string[] args)
        {
            Task6();
        }

        static void Task1()
        {
            int number = int.Parse(Console.ReadLine());
            int[] result = new int[10];

            for (int i = 0; i < 10; i++)
            {
                result[i] = (i + 1) * number;
            }

            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine(result[i]);
            }
        }

        static void Task2()
        {
            int[] numbers = new int[10];
            for (int i = 0; i < 10; i++)
            {
                numbers[i] = int.Parse(Console.ReadLine());
            }

            for (int i = 0; i < 10; i++)
            {
                Console.Write($"" + numbers[i] + ",");
            }
        }

        static void Task3()
        {
            int size = int.Parse(Console.ReadLine());
            int[] arr = new int[size];

            for (int i = 0; i < size; i++)
            {
                arr[i] = int.Parse(Console.ReadLine());
            }

            for (int i = size - 1; i >= 0; i--)
            {
                Console.Write($"" + arr[i] + ",");
            }
        }

        static void Task4()
        {
            int sizeOne = int.Parse(Console.ReadLine());
            int[] arrOne = new int[sizeOne];

            for(int i = 0; i < sizeOne; i++)
            {
                arrOne[i] = int.Parse(Console.ReadLine());
            }

            int sizeTwo = int.Parse(Console.ReadLine());
            int[] arrTwo = new int[sizeTwo];
            for (int i = 0; i < sizeTwo; i++)
            {
                arrTwo[i] = int.Parse(Console.ReadLine());
            }

            bool ArraysAreEqual = false;
            if (sizeOne == sizeTwo)
            {
               for (int i = 0; i < sizeOne; i++)
                {
                    for (int j = 0; j < sizeOne; j++)
                    {
                        if (arrOne[i] != arrTwo[i])
                        {
                            Console.WriteLine("Arrays are not equal, the lengths are equal");
                            return;
                        }
                        else
                        {
                            ArraysAreEqual = true;
                        }
                    }
               }

               if (ArraysAreEqual)
               {
                    Console.WriteLine("Arrays are equal, the lengths are equal");
               }
            }
            else
            {
                Console.WriteLine("The lengths are not equal");
            }
        }

        static void Task5()
        {
            int size = 3;
            int[,] arr = new int[size, size];

            for (int i = 0; i < size; i++)
            {
                for (int j = 0; j < size; j++)
                {
                    arr[i, j] = int.Parse(Console.ReadLine());
                }
            }

            for (int i = 0; i < size; i++)
            {
                for (int j = 0; j < size; j++)
                {
                    Console.Write(arr[i, j]);
                }
                Console.WriteLine();
            }
        }

        static void Task6()
        {
            int size = int.Parse(Console.ReadLine());
            int[,] arr = new int[size, size];

            for (int i = 0; i < size; i++)
            {
                for (int j = 0; j < size; j++)
                {
                    arr[i, j] = int.Parse(Console.ReadLine());
                }
            }

            for (int i = 0; i < size; i++)
            {
                for (int j = 0; j < size;j++)
                {
                    Console.Write(arr[i, j]);
                }
                Console.WriteLine();
            }

            int sumOfRightDiagonal = 0;
            for (int i = 0; i < size; i++)
            {
                for (int j = 0; j < size; j++)
                {
                    if (i == j)
                    {
                        sumOfRightDiagonal += arr[i, j];
                    }
                }
            }
            Console.WriteLine(sumOfRightDiagonal);
        }
    }
}