#include <bits/stdc++.h>
using namespace std;

int main(){
    int start_i = 0, start_j = 0;
    int end_i, end_j;
    int i, j, l, cnt = 1, N, flag = 0;
    int num[30][30];

    cin >> N;
    end_i = N - 1;
    end_j = N - 1;

    while(1){
        for(l = start_j; l <= end_j; l++){
            num[start_i][l] = cnt++;
            if(cnt == N*N + 1){
                flag = 1;
                break;
            }
        }
        if(flag == 1)   break;
        start_i++;
        for(l = start_i; l <= end_i; l++){
            num[l][end_j] = cnt++;
            if(cnt == N*N + 1){
                flag = 1;
                break;
            }
        }
        if(flag == 1)   break;
        end_j--;
        for(l = end_j; l >= start_j; l--){
            num[end_i][l] = cnt++;
            if(cnt == N*N + 1){
                flag = 1;
                break;
            }
        }
        if(flag == 1)   break;
        end_i--;
        for(l = end_i; l >= start_i; l--){
            num[l][start_j] = cnt++;
            if(cnt == N*N + 1){
                flag = 1;
                break;
            }
        }
        if(flag == 1)   break;
        start_j++;
    }

    for(i = 0; i < N; i++){
        for(j = 0; j < N; j++){
            printf("%03d ", num[i][j]);
        }
        printf("\n");
    }

    return 0;
}