import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int [][]map= new int[N][N];
        int num=1;
        int dir=0;
        int x=0;
        int y=0;
        while(num<=N*N){
            int t=dir%4;
            if(t==0){
                map[y][x]=num;
                num++;
                if(x==N-1||map[y][x+1]!=0){
                    dir++;
                    y++;
                    continue;
                }
                x++;
            }else if(t==1){
                map[y][x]=num;
                num++;
                if(y==N-1||map[y+1][x]!=0){
                    dir++;
                    x--;
                    continue;
                }
                y++;
            }else if(t==2){
                map[y][x]=num;
                num++;
                if(x==0||map[y][x-1]!=0){
                    dir++;
                    y--;
                    continue;
                }
                x--;
            }else{
                map[y][x]=num;
                num++;
                if(y==0||map[y-1][x]!=0){
                    dir++;
                    x++;
                    continue;
                }
                y--;
            }
        }
        for(int i=0; i<N; i++){
            for(int j=0; j<N; j++){
                System.out.print(String.format("%03d",map[i][j]));
                if(j!=N-1){System.out.print(" ");}
            }System.out.println();
        }
    }
}