#include <iostream>
using namespace std;

int N;

int** mas, index = 1;

void inside(int st) { // st - строка
    for (int i = st; i < N - st; i++) {
        mas[st][i] = index;
        index++;
    }

    index--;
    for (int i = st; i < N - st; i++) {
        mas[i][N - 1 - st] = index;
        index++;
    }

    index--;
    for (int i = N - st - 1; i >= st; i--) {
        mas[N - 1 - st][i] = index;
        index++;
    }

    index--;
    for (int i = N - st - 1; i > st; i--) {
        mas[i][st] = index;
        index++;
    }
}

void print() { // row - строка, col - столбец

    for (int row = 0; row < N; row++) {
        for (int col = 0; col < N; col++) {
            cout << mas[row][col] << " ";
        }
        cout << endl;
    }
}

int main() {

    cin >> N;

    mas = new int* [N];

    for (int i = 0; i < N; i++) {
        mas[i] = new int[N];
    }

    for (int i = 0; i < N; i++) {
        inside(i);
    }

    print();

    return 0;
}