A plot of land sold in different assessment year

A plot of land purchased in year 2000 at Rs. 20000. Half of land sold in December 2015 at Rs. 500000. Assessee purchased a residential house at Rs. 1000000 in july 2016. And half of land sold in January 2017 at Rs. 1000000. Now , how to calculate capital gain and section 54f (keeping in the mind of assessee) Whether assessee get benifit 54f for both assessment year ?