import java.util.Arrays;
import java.util.Scanner;// 给出一个不大于9的正整数n，输出n×n的蛇形方阵。
public class Main {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int n = sc.nextInt();int[][] a = new int[n][n];int total = 1;int x = 0;int y = 0;a[x][y] = 1;while (total <n * n) {while (y<n-1 && a[x][y+1] == 0) {a[x][++y] = ++total;}while (x<n-1 && a[x+1][y] == 0) {a[++x][y] = ++total;}while (y>0 && a[x][y-1] == 0) {a[x][--y] = ++total;}while (x>0 && a[x-1][y] == 0) {a[--x][y] = ++total;}}for (int i = 0; i < n; i++) {for (int j = 0; j < n; j++) {System.out.printf("%3d",a[i][j]);}System.out.println();}}
}

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