N = int(input())

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

dir = 0
x, y = 0, 0
ans = [[None] * N for _ in range(N)]
ans[y][x] = 1
for num in range(2, N*N+1):
    if (x < 0 or N <= x + dx[dir]
     or y < 0 or N <= y + dy[dir]
     or ans[y + dy[dir]][x + dx[dir]] != None):
        dir = (dir + 1) % 4
    x += dx[dir]
    y += dy[dir]
    ans[y][x] = num

for y in range(N):
    print(*['{:03d}'.format(num) for num in ans[y]])