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import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

/*
4 4
1 2 4 3
1 1
2 2
3 0
4 4
 */
public class sia {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int pow = Integer.parseInt(scanner.next());
        int mowingsCount = Integer.parseInt(scanner.next());
        List<Long> mowingHeightList = new ArrayList<Long>(pow);
        List<Long> mowingGrow = new ArrayList<Long>(pow);
        List<Long> resultMowing = new ArrayList<Long>(mowingsCount);
        for (int i = 0; i < pow; i++){
            long grow = Long.parseLong(scanner.next());
            mowingHeightList.add(grow);
            mowingGrow.add(grow);
        }

        long step = 0;
        do {
            step = Long.parseLong(scanner.next());
            long mowingHeight = Long.parseLong(scanner.next());
            long mowingResult = 0;
            for (int i = 0; i < mowingHeightList.size(); i++) {
                long aLong = mowingHeightList.get(i);

                if (aLong >= mowingHeight){
                    mowingHeightList.set(i, mowingHeight + mowingGrow.get(i));
                    mowingResult += (aLong - mowingHeight);
                }
            }

            resultMowing.add(mowingResult);
        }while (pow != step);

        for (Long aLong : resultMowing) {
            System.out.println(aLong);
        }
    }
}