Optimizing and Shortening Code

Question

How can I optimize the given code which calculates the factorial of a number.
https://code.sololearn.com/c7m1MD6M4IsP/?ref=app

Answer 1

I'd go like this.

n=1
for i in range(2, int(input()+1)):
n*=i
print(n)

Regard the +1:

input of 5 should give 120 as a result, but range(5) stops after 4.

Answer 2

https://code.sololearn.com/c3eg8MvlATAf/?ref=app
https://code.sololearn.com/cOInw4yJq7wi/?ref=app
https://code.sololearn.com/cE7lXk0wwKMN/?ref=app
https://code.sololearn.com/c4phTP2wUQ3u/?ref=app
https://code.sololearn.com/cOfMIY803RdZ/?ref=app
https://code.sololearn.com/c4Q0rFUFxZIP/?ref=app
https://code.sololearn.com/cj7pAcAEmqTm/?ref=app