The popular item at Phoebe's Machine.
Shop is a number-producing machine. .
This machine runs on a secret       .
mathematical function and produces  .
each customer's favorite numbers.   .
The machine takes two numbers as    .
input and uses them in the secret   .
function to produce the final       .
number.                             .
                                    .
When customers can't figure out how .
to get their machine to produce a   .
particular number, they bring the   .
machine back to Phoebe for help.    .
                                    .
Right now Phoebe is overrun with    .
function machines.                  .
                                    .
                                    .
                                    .
She's desperate for an assistant    .
like you who can figure out what two.
numbers need to be put into each    .
machine so that it will produce the .
number the customer wants.          .
The number the customer wants will  .
appear here.                        .
                                    .
                                    .
                                    .
You type the numbers that go into   .
the function machine here...        .
                                    .
                                    .
                                    .
and here.                           .
                                    .
                                    .
                                    .
                                    .
The number the machine produces will.
come out here.                      .
                                    .
                                    .
                                    .
Try different numbers for x and y   .
until you figure out what function  .
the machine is using. Then decide   .
which numbers the function needs to .
produce the customer's number.      .