View Code of Problem 53

n = eval(input())
for i in range(n):
    print(' ' * (n - i - 1), end='')
    print('*' * (i * 2 + 1), end='')
    print()
for i in range(n - 1, -1, -1):
    print(' ' * (n - i), end='')
    print('*' * (i * 2 - 1), end='')
    print()