#include<iostream>
#include<cmath>
#include<cstdio>
using namespace std;
int main(){
	int field[32][32]={0};
	int n;
	cin >> n;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			field[i][j]=1000;
		}
	}
	int x=0,y=1,flag=0,num=1;
	while(num<=(n*n)){
		switch(flag){
			case 0:
				x++;
				if(field[y][x]==1000)	field[y][x]=num;
				else{
					 flag=1;
					 x--;
					 num--;
				}
				break;
			case 1:
				y++;
				if(field[y][x]==1000)	field[y][x]=num;
				else{
					 flag=2;
					 y--;
					 num--;
				}
				break;
			case 2:
				x--;
				if(field[y][x]==1000)	field[y][x]=num;
				else{
					x++;
					flag=3;
					num--;
				}
				break;
			case 3:
				y--;
				if(field[y][x]==1000)	field[y][x]=num;
				else{
					y++;
					flag=0;
					num--;
				}
				break;
		}
		num++;
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<=n;j++){
			if(j!=1)	printf(" ");
			printf("%03d",field[i][j]);
		}
		printf("\n");
	}
	return 0;
}