---

using System;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Vvedite kolichestvo strok: ");
        int n = Convert.ToInt32(Console.ReadLine());

        int[,] a = new int[n, n];

        Console.WriteLine("Vvedite elementi massiva: ");
        
        for (int i = 0; i < n; i++)
        {
            for (int k = 0; k < n; k++)
            {
                a[i, k] = int.Parse(Console.ReadLine());
                Console.Write($"{a[i, k]} \t");
            }
            Console.WriteLine();
        }

        int summa_glavnoy = 0;
        int S1 = 0; 
        int S2 = 0; 

        for (int i = 0; i < n; i++)
        {
            summa_glavnoy += a[i, i];

            for (int j = 0; j < i; j++)
            {
                S1 += a[i, j];
            }

            for (int j = i + 1; j < n; j++)
            {
                S2 += a[i, j];
            }
        }

        Console.WriteLine($"\nSumma elementov glavnoy diagonali: {summa_glavnoy}");
        Console.WriteLine($"S1 (summa nizhe glavnoy): {S1}");
        Console.WriteLine($"S2 (summa vyshe glavnoy): {S2}");
        
        Console.ReadKey();
    }
}