https://www.acmicpc.net/problem/2522
n=int(input())
for i in range(1,n+1):
for j in range(n-i,0,-1): print(" ",end='')
for j in range(i): print("*",end='')
print()
for i in range(n-1,0,-1):
for j in range(n-i,0,-1): print(" ",end='')
for j in range(i): print("*",end='')
print()