import java.util.Scanner;

public class SpiralMatrix {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[][] matrix = new int[n][n];
        int num = 1;
        int row = 0;
        int col = 0;
        while (num <= n * n) {

            // GO RIGHT
            for (; col < n; col++) {
                if (matrix[row][col] == 0) {
                    matrix[row][col] = num++;
                } else {
                    col--;
                    break;
                }
            }

            // GO DOWN
            if (col >= n) {
                col--;
            }
            if (col < 0) {
                col = 0;
            }

            row++;
            for (; row < n; row++) {
                if (matrix[row][col] == 0) {
                    matrix[row][col] = num++;
                } else {
                    row--;
                    break;
                }
            }

            // GO LEFT
            if (row < 0) {
                row = 0;
            }

            if (row >= n) {
                row--;
            }
            col--;
            for (; col >= 0; col--) {
                if (matrix[row][col] == 0) {
                    matrix[row][col] = num++;
                } else {
                    col++;
                    break;
                }
            }

            // GO UP

            if (col < 0) {
                col = 0;
            }
            row--;
            if (row < 0) {
                row = 0;
            }
            for (; row >= 0; row--) {
                if (matrix[row][col] == 0) {
                    matrix[row][col] = num++;
                } else {
                    row++;
                    break;
                }
            }
            col++;
            if (col >= n) {
                col--;
            }
            if (row >= n) {
                row--;
            }
        }

        // PRINT MATRIX

        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                System.out.print(matrix[i][j]);
                if (matrix[i][j] < 10) {
                    System.out.print("  ");
                } else {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
}