using System;

class SpiralMatrix
{
    static void Main()
    {
        int n = int.Parse(Console.ReadLine());
        int[,] array = new int[n, n];

        int left = 0;
        int right = n - 1;
        int top = 0;
        int bottom = n - 1;
        int number = 1;

        while (left <= right && top <= bottom)
        {
            for (int i = top, j = left; j <= right; ++j)
            {
                array[i, j] = number;
                ++number;
            }
            ++top;

            for (int i = top, j = right; i <= bottom; ++i)
            {
                array[i, j] = number;
                ++number;
            }
            --right;

            for (int i = bottom, j = right; j >= left; --j)
            {
                array[i, j] = number;
                ++number;
            }
            --bottom;

            for (int i = bottom, j = left; i >= top; --i)
            {
                array[i, j] = number;
                ++number;
            }
            ++left;
        }

        for (int i = 0; i < n; ++i)
        {
            for (int j = 0; j < n; ++j)
            {
                Console.Write("{0,3} ", array[i, j]);
            }
            Console.WriteLine();
        }
    }
}