#include <iostream>
#include <iomanip>
#include <cstring>
using namespace std;
const int N = 105;
int a[N][N];
int main() {
	int n, x, y,count;
	cin>> n;
	memset(a,0,sizeof(a));
	count=a[x=0][y=n-1]=1;
	while (count<n*n) {
		while (x+1<n && !a[x+1][y]) a[++x][y]= ++count;
		while (y-1>=0&&!a[x][y- 1]) a[x][--y]= ++count;
		while (x-1>=0&&!a[x-1][y])  a[--x][y]= ++count;
		while (y+1<n &&!a[x][y+1])  a[x][++y]= ++count;
	}
for (x=0; x<n; x++) {
		for (y=0; y<n; y++) {
			cout<<setw(5)<<a[x][y];
		}
		cout<<endl;
	}
	return 0;
}