x = int(input())
i = 0
while i < x:
    j = 0
    while j < x:
        if i == 0 or i == x-1 or j == 0 or j == x-1 or j == i:
            print("*", end = "")
        else:
            print(" ", end = "")
        j +=1
    print()
    i += 1