HW3, what points were taken off for...

-1 Did not fill in name
-1 Did not list collaborators

-1 Small mistake in building distance formula.
-2 Larger mistake in building distance formula.
-3 Very big mistake with formula, or not even having the formula in the code.

-1 sayHello not printing, or only printing name, or some similar small-ish issue.
-2 sayHello uses raw_input, or otherwise not correctly taking its input.

-4 no sayHello function.

Extra credit: 
+1 all correct, but returning monthly rather than total payment.

0/10 program does not load/run.