#include<iostream>
#include<cstdio>
using namespace std;
int main(){
    int N;
    int ans[32][32] = {};
    int xdir[4]= {1,0,-1,0};
    int ydir[4]= {0,1,0,-1};
    int dir = 0;
    int x=1;
    int y=1;
    cin >> N;
    for(int i=0;i<32;i++){
        for(int j=0;j<32;j++){
            if(i*j == 0 || i > N || j > N) ans[i][j] = -1;
        }
    }
    ans[1][1] = 1;
    for(int i=2;i<=N*N;i++){
        if(ans[y+ydir[dir]][x+xdir[dir]] != 0){
            dir = (dir+1)%4;
        }
        x += xdir[dir];
        y += ydir[dir];
        ans[y][x] = i;
    }
    for(int i=1;i<=N;i++){
        for(int j=1;j<=N;j++){
            printf("%03d ",ans[i][j]);
        }
        printf("\n");
    }
    return 0;
}