#include <string>
#include <iostream>
using namespace std;

int main() {
	int dxIn[] = {1, 0, -1, 0};
	int dyIn[] = {0, 1, 0, -1};
	int field[30][30];
	for(int i = 0; i < 30; i++){
		for(int j = 0; j < 30; j++){
			field[i][j] = 0;
		}
	}
	int n;
	cin >> n;
	int x=0, y=0;
	int dInd = 0;
	int num=1;
	while(num <= n * n){
		field[x][y] = num;
		if((x+dxIn[dInd] == n) || (y+dyIn[dInd] == n) || (x+dxIn[dInd]==-1) || (y+dyIn[dInd]==-1)){
			dInd = (dInd + 1) % 4;
		}else if(field[x+dxIn[dInd]][y+dyIn[dInd]] > 0){
			dInd = (dInd + 1) % 4;
		}
		x+=dxIn[dInd]; y+=dyIn[dInd];
		num++;
	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < n; j++){
			if(field[j][i] < 10){
				cout << "00";
			}else if(field[j][i] < 100){
				cout << "0";
			}
			cout << field[j][i] << " ";
		}
		cout << endl;
	}
	return 0;
}