using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Kolos2
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Podaj wymiar macierzy");
            int size = Convert.ToInt32(Console.ReadLine());
            int[,] macierz = new int[size, size];
            bool check = false;

            Console.WriteLine("Podaj wartości macierzy");
            for (int row = 0; row < size; row++)
            {
                for (int col = 0; col < size; col++)
                {
                    macierz[row, col] = Convert.ToInt32(Console.ReadLine());
                }
            }

            for (int row = 0; row < size; row++)
            {
                for (int col = 0; col < size; col++)
                {
                    if ((row == col && macierz[row, col] == 1) || (row != col && macierz[row, col] != 1))
                        check = true;
                    else
                    {
                        check = false;
                        break;
                    }
                }
            }

            if (check)
                Console.WriteLine("Macierz jest jednostkowa");
            else
                Console.WriteLine("Macierz nie jest jednostkowa");
            Console.ReadKey();
        }
    }
}