I successfully compiled my program. Now how do I run it?

Question

I want to solve Project Euler Problem 1:

If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these

Answer 1

You can't run pdf files. You need to use the latex command instead of pdflatex. e.g.

latex Problem1.tex

Here's some documentation