import java.util.*;
import java.util.stream.Collectors;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int m = sc.nextInt();
        int[] a = new int[300001];
        int[] s = new int[300001];
        List<Integer> axis = new ArrayList<>();
        List<Pairs> add = new ArrayList<>(); //用来存n次操作
        List<Pairs> query = new ArrayList<>(); //用来存m次询问
        for(int i = 0; i < n; i++){
            int x = sc.nextInt();
            int c = sc.nextInt();
            add.add(new Pairs(x,c));
            axis.add(x);
        }

        for(int i = 0; i < m; i++){
            int l = sc.nextInt();
            int r = sc.nextInt();
            query.add(new Pairs(l, r));
            axis.add(l);
            axis.add(r);
        }
        //axis数组去重
        axis = axis.stream().sorted().distinct().collect(Collectors.toList());

        for (Pairs item : add) {
            int index = find(item.first, axis);
            a[index] += item.second;
        }

        for (int i = 1; i <= axis.size(); i++) s[i] = s[i - 1] + a[i];

        for (Pairs item : query) {
            int l = find(item.first, axis);
            int r = find(item.second, axis);
            System.out.println(s[r] - s[l - 1]);
        }
    }

     static int find(int x, List<Integer> list) {
        int l = 0;
        int r = list.size()-1;
        while (l < r) {
            int mid = (l + r +1) >> 1;
            if (list.get(mid) > x) {
                 r = mid-1;
            } else {
                l = mid;
            }
        }
        return l+1; //因为要考虑到前缀和
    }
}

class Pairs {
    int first;
    int second;

    public Pairs(int first, int second) {
        this.first = first;
        this.second = second;
    }
}