int n = int.Parse(Console.ReadLine());
            int[,] tablica = new int[n,n];
            // Vuvejdane na tablicata
            for (int i = 0; i < n; i++)
            {
                string line = Console.ReadLine();
                string[] rowNumbersS = line.Split(' ');
                for(int j = 0; j < n; j++)
                {
                    tablica[i, j] = int.Parse(rowNumbersS[j]);
                }
            }
            int sumDiag1 = 0;
            // diagonal 1
            for (int i = 0; i < n; i++)
            {
                sumDiag1 += tablica[i, i];
            }
            int sumDiag2 = 0;
            for (int i = 0; i < n; i++)
            {
                sumDiag2 += tablica[i,n - i - 1];
            }
            if (sumDiag1 != sumDiag2)
            {
                Console.WriteLine("NE");
            }
            else
            {
                int sumRed0 = 0;
                for (int i = 0; i < n; i++)
                {
                    sumRed0 += tablica[0, i];
                }
                if (sumRed0 != sumDiag1)
                {
                    Console.WriteLine("NE");
                    return;
                }
                int sumRed = 0;
                for (int red = 1; red < n; red++)
                {
                    sumRed = 0;
                    for (int kol = 0; kol < n; kol++)
                    {
                        sumRed += tablica[red, kol];
                    }
                    if (sumRed != sumRed0)
                    {
                        Console.WriteLine("NE");
                        return;
                    }
                }
                int sumKol0 = 0;
                for (int i = 0; i < n; i++)
                {
                    sumKol0 += tablica[i, 0];
                }
                if (sumKol0 != sumRed0)
                {
                    Console.WriteLine("NE");
                    return;
                }
                int sumKol = 0;
                for (int kol = 1; kol < n; kol++)
                {
                    sumKol = 0;
                    for (int red = 0; red < n; red++)
                    {
                        sumKol += tablica[red, kol];
                    }
                    if (sumKol != sumKol0)
                    {
                        Console.WriteLine("NE");
                        return;
                    }
                }
                Console.WriteLine("DA");
            }