#include<bits/stdc++.h>
using namespace std;
int sxts[25][25];
int main(){
	int n;
	cin>>n;
	int x=1;
	int hang=1,lie=n;
	sxts[hang][lie]=x;
while(x<n*n)
{
	while(hang<n&&sxts[hang+1][lie]==0)
	{
		hang++;
		x++;
		sxts[hang][lie]=x;
	 } 
	while(lie>1&&sxts[hang][lie-1]==0)
	{
		lie--;
		x++;
		sxts[hang][lie]=x;
	 }
	 while(hang>1&&sxts[hang-1][lie]==0)
	{
		hang--;
		x++;
		sxts[hang][lie]=x;
	 }
	 while(lie<n&&sxts[hang][lie+1]==0)
	{
		lie++;
		x++;
		sxts[hang][lie]=x;
	}
}
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n;j++)
		{
			cout<<sxts[i][j]<<" ";
		}
		cout<<endl; 
	}
	return 0;
}