You are creating the function funChallenge, but in order to run the code inside it, you have to call it, like this:

let n = funChallenge(100);

Please mark this as the answer if it solved your problem :)

p.s. also note, the code will crash because you are calling anotherFunction(); inside it, and you haven't defined anotherFunction(). You will want to define that function too.

e.g.

function anotherFunction() {
  console.log('another function!');
}