import java.util.*; This is the solution came up with, the formatting might be a little easier to understand.

public class Solution {
   public static void main(String[] args) {
       Scanner in = new Scanner(System.in);
       int numContests = in.nextInt();
       int maxLosses = in.nextInt();
       ArrayList<Integer>contestLucks = new ArrayList<Integer>();
       int totalLuck = 0;
       for(int i = 0;i<numContests;i++){
           int currContestLuck = in.nextInt();
           int temp = in.nextInt();
           if(temp ==0)totalLuck+=currContestLuck;
           else contestLucks.add(currContestLuck);
       }
       Collections.sort(contestLucks);
       for(int i = 0;i<contestLucks.size();i++){
           if(i<contestLucks.size()-maxLosses)totalLuck-=contestLucks.get(i);
           else totalLuck +=contestLucks.get(i);
       }
       System.out.println(totalLuck);
   }
}