#include<bits/stdc++.h>
using namespace std;
 
int main()
{
  int N, S[30][30] = {{}};

  scanf("%d", &N);
  int sx = -1, sy = 0, sd = 0;
  const int dy[] = {0, 1, 0, -1}, dx[] = {1, 0, -1, 0};
  for(int i = 1; i <= N * N; i++) {
    int nx = sx + dx[sd], ny = sy + dy[sd];
    while(nx < 0 || ny < 0 || nx >= N || ny >= N || S[ny][nx] > 0) {
      sd = (sd + 1) % 4;
      nx = sx + dx[sd], ny = sy + dy[sd];
    }
    S[ny][nx] = i;
    sx = nx, sy = ny;
  }
  for(int i = 0; i < N; i++) {
    for(int j = 0; j < N; j++) {
      printf("%03d%c", S[i][j], " \n"[j == N - 1]);
    }
  }
}