#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    int N; cin >> N;
    vector<vector<int>> A(N, vector<int>(N, -1));
    int i = 0, j = 0, cnt = 1, d = 0;
    int di[] = {0, +1, 0, -1};
    int dj[] = {+1, 0, -1, 0};
    while(true) {
        A[i][j] = cnt++;
        int ni = i + di[d], nj = j + dj[d];
        if(0 <= ni && ni < N && 0 <= nj && nj < N) {
            if(A[ni][nj] == -1) {
                i = ni, j = nj;
                continue;
            }
            else {
                d = (d + 1) % 4;
                int ni = i + di[d], nj = j + dj[d];
                if(0 <= ni && ni < N && 0 <= nj && nj < N && A[ni][nj] == -1) {
                    i = ni; j = nj;
                    continue;
                } else {
                    break;
                }
            }
        } else {
            d = (d + 1) % 4;
            int ni = i + di[d], nj = j + dj[d];
            if(0 <= ni && ni < N && 0 <= nj && nj < N && A[ni][nj] == -1) {
                i = ni; j = nj;
                continue;
            } else {
                break;
            }
        }
    }

    rep(i,N) {
        rep(j,N) printf("%03d ", A[i][j]);
        printf("\n");
    }
}