length = int(input())
shape = ""

for n in range(1, length + 1):
    for m in range(1, length + 1):
        sides = n == 1 or n == length or m == 1 or m == length
        diagonal = n == m or n == length - m + 1
        if sides or diagonal:
            shape += "*"
        else:
            shape += " "
    else:
        if n != length:
            shape += "\n"
else:
    print(shape)