Solving 'The Python Challenge' with RubyLevel 0 - warming up

As I'm learning Ruby, the most efficient way is practice. Therefore, I try to solve the The Python Challenge using Ruby. Here is the level 0 - warming up . In the webpage, a picture is shown:




Obviously, solving the calculation can get the answer. So I execute the following command:

ruby -e "puts 2**38"

and I get:

274877906944

Therefore, the URL of the next level is here.