#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
	int n,k = 1;
	cin >> n;
	int a[101][101];
	for(int i = 1;i <= (n + 1) / 2;i++)
	{
		for(int j = i;j <= n + 1 - i;j++)
			a[i][j] = k++;
		for(int j = i + 1;j <= n + 1 - i;j++)
			a[j][n + 1 - i] = k++;
		for(int j = n - i;j >= i;j--)
			a[n + 1 - i][j] = k++;
		for(int j = n - i;j >= i + 1;j--)
			a[j][i] = k++;
	}
	for (int i = 1;i <= n;i++)
	{
		for (int j = 1;j <= n - 1;j++)
			cout << a[i][j] << ' ';
		cout << a[i][n];
		if (i != n)
			cout << endl; 
	}
	return 0;
}
//最短代码