"""
n = 4
0 1 2 3 4 5 6 7 8
0 * * * * 1 * * * * 1
1 * * * 2 2 2 * * * 3
2 * * 3 3 3 3 3 * * 5
3 * 4 4 4 4 4 4 4 * 7
0 * 1 1 1 1 1 1 1 * 7
1 * * * * 5
2 * * * * * * 3
3 * * * * * * * * 1
(2n+1)
0 = 1
1 = 3
2 = 5
3 = 7
(2n-1)
3 = 7
2 = 5
1 = 3
0 = 1
"""
def hollowrangoli(n):
"""
* * * * * * * *
* * * * * *
* * * *
* *
* *
* * * *
* * * * * *
* * * * * * * *
"""
for i in range(n):
print(" ".join((" "*(2*i+1)).center(2*n + 1,'*',)))
for j in range(n-1,-1,-1):
print(" ".join((" "*(2*j+1)).center(2*n + 1,'*',)))
if __name__ == '__main__':
n = int(input('size: '))
hollowrangoli(n)