>>> i=1

>>> while i<=int(input()):

if i%2==0:

print(' ')

else:

print(i,end=' ')

i+=1


20

1 

Traceback (most recent call last):

  File "<pyshell#7>", line 1, in <module>

    while i<=int(input()):

ValueError: invalid literal for int() with base 10: ''

>>> 

>>> 


이거 왜 에러뜨는건지좀 알려줄 사람있나여