#include<iostream>
#include<cstdio>
#include<cmath>
#include<algorithm> 
#include<string>
#include<cstring>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int res[20][20] = { 0 };
    int dx[] = { 1,0,-1,0 };
    int dy[] = { 0,1,0,-1 };
    for (int x = 0, y = 0, d = 0, k = 1; k <= n * n; k++){
        res[x][y] = k;
        int a = x + dx[d], b = y + dy[d];
        if (a < 0 || a >= n || b < 0 || b >= n || res[a][b]) {
            d = (d + 1) % 4;
            a = x + dx[d], b = y + dy[d];
        }
        x = a, y = b;
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++)printf("%-4d", res[i][j]);
        cout << endl;
    }
    return 0;
}