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

namespace ConsoleApplication14
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Введите n > 0");
            int n = GetNumber();
            Console.WriteLine("Введите длину столбца");
            int row = GetNumber();
            int col = (n / row) + 1;
            int[,] array = new int[row, col];
            int i = 0, j = 0, temp = 1;
            while (i < col)
            {
                while (j < row)
                {
                    if (temp <= n)
                    array[j,i] = temp;
                    else array[j, i] = -1;
                    temp++;
                    j++;
                }
                i++;
                j--;
                if (i >= col)
                    break;
                while (j >= 0)
                {
                    if (temp <= n)
                        array[j, i] = temp;
                    else array[j, i] = -1;
                    temp++;
                    j--;
                }
                i++;
                j++;

            }
            for (int f = 0; f < row; f++)
            {
                Console.WriteLine();
                for (int k = 0; k < col; k++)
                    Console.Write(array[f, k] + "  ");
            }
            Console.Read();


        }

        private static int GetNumber()
        {
            string data = Console.ReadLine();
            int f = 0;
            while (true)
            {
                if (Int32.TryParse(data, out f))
                    if (Int32.Parse(data) > 0)
                        break;
                    else Console.WriteLine("Введите число больше 0");
                else Console.WriteLine("Введите число");
                data = Console.ReadLine();
            }
            return Int32.Parse(data);
        }
    }
}