n = int(input()) matrix = [] for i in range(n): row = [] for j in range(n): # 计算当前位置所在的层数 k = min(i, j, n - 1 - i, n - 1 - j) + 1 row.append(k) matrix.append(row) # 输出结果 for row in matrix: print(' '.join(map(str, row)))