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

int res[25][25] = {0};

int main()
{
    int n;
    cin >> n ;
    int x = 0,y = 0;  
    int dx[] = {1,0,-1,0};
    int dy[] = {0,1,0,-1};
    
    for(int d = 0,k = 1;k <=n*n;k++)
    {
        res[x][y] = k;
        int a = x + dx[d];
        int b = y + dy[d];
        if(a >= n || a < 0 || b >= n || b < 0 || res[a][b])
        {
            d = (1+d) % 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]);
        }
        printf("\n");
    }
    return 0;
}