HELP ME - CHEF PIZZA PARTY

[PRINCEPS911]

https://www.codechef.com/problems/PIZPAR
I was asked to write a program to find
out the maximum number of slices he can get following the constraints.

  1 ≤ M ≤ 2*105
  1 ≤ N,Ai ≤ 2*105

[AbstractionAnon]

So what is your question?
We're not going to write the code for you.