#include <bits/stdc++.h>
using namespace std;

void sparalMat(int *array[],int n)
{    
    int time = 0;
    int start = 1; //左上角起始点,做个补充，这个是每一个外壳，第一个起始点。
    while (time < n)
    {
        if (n-1-time==0)
        {
            array[time / 2][time / 2] = start;
        }
        for (int i = 0; i < n-1-time; ++i)
        {
            array[(time / 2)][time/2+i] = start + i;
            array[time / 2 + i][n - 1 - time / 2] = start + (n - time - 1) + i;
            array[n-1 - time / 2][n-1 - time / 2 - i] = start + 2 * (n - 1 - time) + i;
            array[n - 1 - time / 2 - i][time / 2] = start + 3 * (n - 1 - time) + i;
        }
        
        start += 4 * (n - 1 - time);
        time += 2;
    }
}

//主函数入口
int main()
{
    int ha = 0;
    cin >> ha;
    int **a = new int*[ha];
    for (int i = 0; i < ha; i++)   //这一块仅仅是动态内存分配，与算法无关
    {
        a[i] = new int[ha];
    }

    sparalMat(a, ha);

    for (int i = 0; i < ha; i++)
    {
        for (int j = 0; j < ha; j++)
        {
            cout << setw(3) << a[i][j];
        }
        cout << endl;
    }
    for (int i = 0; i < ha; i++)    //内存释放，我觉得有必要释放，即使是在程序结束时。
    {
        delete [] a[i];
    }
    delete[] a;
    return 0;
}