"""
[23055: 공사장 표지판](https://www.acmicpc.net/problem/23055)
Tier: Bronze 2
Category: 구현
"""
def solution(n):
for i in range(n):
for j in range(n):
if i == 0 or j == 0 or i == n - 1 or j == n - 1 or i == j or i == n - j - 1:
print(end="*")
else:
print(end=" ")
print()
if __name__ == '__main__':
solution(int(input()))