#include<iostream>
using namespace std;
int main()
{
	int a[20][20],n,i,j,k,x;
	cin>>n;
	x=1;
	for(k=1;k<=(n+1)/2;k++)
	{
		for(j=k;j<=n+1-k;j++) a[k][j]=x++;
		for(i=k+1;i<=n+1-k;i++) a[i][n+1-k]=x++;
		for(j=n-k;j>=k;j--) a[n+1-k][j]=x++;
		for(i=n-k;i>=k+1;i--) a[i][k]=x++;
	}
	for(i=1;i<=n;i++)
	{
		for(j=1;j<=n;j++) cout<<a[i][j]<<" ";
		cout<<endl;
	}
	return 0;
}