import time
number = int(input('Enter a number: '))

count = 1
while count <= number:
    time.sleep(0.001)
    print( count )
    time.sleep(0.001)
    count = count + 1

count = number - 1
while count >= 1:
    time.sleep(0.001)
    print( count )
    time.sleep(0.001)
    count = count - 1