Butterfly (book)

n = int(input())
half_row_size = n - 2

for i in range(half_row_size):
  if i % 2 == 1:
    print("{0}\\ /{0}".format("-" * half_row_size))
  else:
    print("{0}\\ /{0}".format("*" * half_row_size))
print("{0}@{0}".format(" " * (n - 1)))

for i in range(half_row_size):
  if i % 2 == 1:
    print("{0}/ \\{0}".format("-" * half_row_size))
  else:
    print("{0}/ \\{0}".format("*" * half_row_size))