N = int(input())
grid = [[0] * N for _ in range(N)]

dx = [0, 1, 0, -1]
dy = [1, 0, -1, 0]

x, y = 0, 0
d = 0
for i in range(1, N * N + 1):
    grid[x][y] = i
    nx = x + dx[d]
    ny = y + dy[d]
    if nx < 0 or nx >= N or ny < 0 or ny >= N or grid[nx][ny] != 0:
        d = (d + 1) % 4
        nx = x + dx[d]
        ny = y + dy[d]
    x, y = nx, ny

for row in grid:
    print(" ".join(f"{x:03}" for x in row))