That's my calculation. But as I've said before my ability with numbers is very limited, and I'm not 100% sure when the points from the DC tie vs Italy last will get dropped (presumably in April). I've been working it all out using Andy's ATP rankings breakdown on the ATP website. I'm fairly certain that Nishikori can't gain any points until Indian Wells.
If your ability with numbers is very limited what hope is there for the rest of us?