#include <iostream>
using namespace std;
typedef struct a{
	int* c;
}a,*a_;
void init(a_ &b,int n) {
	b = (a_)malloc(sizeof(a) * (n));
	for (int i = 0; i < n; i++)
		b[i].c = (int*)malloc(sizeof(int*) * n);
}
int main() {
	int n;
	cin >> n;
	a_ b;
	init(b, n);
	int t = 1,m=0;
	while (m < (n + 1) / 2) {
		for (int i = 0 + m; i < n - m; i++)
			b[0 + m].c[i] = t++;
		for (int i = 1+m; i < n - m; i++)
			b[i].c[n - 1 - m] = t++;
		for (int i = n - 2-m; i >= 0 + m; i--)
			b[n - 1 - m].c[i] = t++;
		for (int i = n - 2-m; i > 0 + m; i--)
			b[i].c[0 + m] = t++;
		m++;
	}
	for (int i = 0; i < n; i++){
		printf("\n")
		for (int j = 0; j < n; j++){
			printf("%3d", b[i].c[j]);
		}
	}
	return 0;
}