Answer Happy

Please solve this question completely and in a (correct) way as soon as possible and in its entirety. An accurate solution, without explanation. I just want the mathematical solution (solid state physics) to give you a very good evaluation.
Question Seven: (3 points) Find the Madelung constant a for the net nearby square ionic lattice starting from the nearest neighbor on. ********* +1+1+ 1+1+1 +1+1+ +1+1 +1+1+