Please read the guidelines here.
This follows the same idea as from Run relax at cloud.sagemath.com
Make a rapid deployment of relax on a google computer cluster, and calculate for 2 months with 8 CPU's, for free.
For this example of Google Cloud Computing, we wan't to have access to as many computer cores as possible
At November 2015, google give free trial of 300$. https://cloud.google.com/free-trial/
Note, there are some limitations: