#include <iostream>
using namespace std;
int main()
{
    int n;
    cin >> n;
    int arr[20][20];
    int k = 0;
    n--;
    int last = 1;
    for (; k <= n / 2; k++) {
        for (int i = k; i <= n - k; i++)
        {
            arr[k][i] = last;
            last++;
        }
        for (int i = k + 1; i <= n - k; i++)
        {
            arr[i][n - k] = last;
            last++;
        }
        for (int i = n - k - 1; i >= k; i--)
        {
            arr[n - k][i] = last;
            last++;
        }
        for (int i = n - k - 1; i > k; i--)
        {
            arr[i][k] = last;
            last++;
        }
    }

    if (++n % 2 != 0) arr[n / 2][n / 2] = --last;

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            cout.width(3);
            cout << arr[i][j];
        }
        cout << "\n";
    }
    return 0;
}