#define IN(x,s,g) ((x) >= (s) && (x) < (g))
#define ISIN(x,y,w,h) (IN((x),0,(w)) && IN((y),0,(h)))

#define REP(i,n) for(int i=0; i<(int)(n); i++)

#include <cstdio>
inline int getInt(){ int s; scanf("%d", &s); return s; }

#include <set>

using namespace std;

int g[30][30];

const int dx[] = {1, 0, -1, 0};
const int dy[] = {0, 1, 0, -1};

int main(){
  const int n = getInt();

  int x = 0;
  int y = 0;
  int d = 0;

  REP(i,n*n) {
    g[y][x] = i + 1;

    if(!ISIN(x + dx[d], y + dy[d], n, n) ||
       g[y + dy[d]][x + dx[d]] != 0)
      d = (d + 1) % 4;

    x = x + dx[d];
    y = y + dy[d];
  }

  REP(i,n) { REP(j,n) printf("%03d ", g[i][j]); puts(""); }

  return 0;
}