n = int(input('Enter size of matrix: '))
dx, dy = 1,0
x, y = 0,0
spiral_matrix = [[None] * n for j in range(n)]

for i in range(n ** 2):
    spiral_matrix[x][y] = i
    nx, ny = x + dx, y + dy
    if 0 <= nx < n and 0 <= ny < n and spiral_matrix[nx][ny] == None:
        x, y = nx, ny
    else:
        dx, dy = -dy, dx
        x, y = x + dx, y + dy

for y in range(n):
    for x in range(n):
        print("%02i" % spiral_matrix[x][y], end=' ')
    print()

print()
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