#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);
    int matrix[n][n];
    int num = 1;
    int left = 0, right = n - 1, top = 0, bottom = n - 1;
    while (left <= right && top <= bottom) {
        // 从左到右填充上侧
        for (int i = left; i <= right; i++) {
            matrix[top][i]=num++;
        }
        top++;
        // 从上到下填充右侧
        for (int i = top; i <= bottom; i++) {
            matrix[i][right]=num++;
        }
        right--;
        if (top <= bottom) {
            // 从右到左填充下侧
            for (int i = right; i >= left; i--) {
                matrix[bottom][i]=num++;
            }
            bottom--;
        }
        if (left <= right) {
            // 从下到上填充左侧
            for (int i = bottom; i >= top; i--) {
                matrix[i][left]=num++;
            }
            left++;
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            // 按照场宽为4输出
            printf("%4d", matrix[i][j]);
        }
        printf("\n");
    }
    return 0;
}