//
// Created by wangliewei on 2021/8/18.
//
#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
//为什么是300000，因为x, l, r各十万

typedef pair<int, int> PII;

const int N = 300010;
int a[N], s[N];
vector<int> alls;//待离散化的坐标
vector<PII> add, query;

//求x离散化后的结果，就是二分求一下下标即可
int find(int x) {
    int l = 0, r = alls.size() - 1;
    while (l < r) {
        int mid = l + r >> 1;
        if(alls[mid] >= x) r = mid;
        else l = mid + 1;
    }
    return r + 1;//从1开始的，因为 要 求前缀和
}


int main() {
    int n, m;
    cin >> n >> m;
    for (int i = 0; i < n; i++) {
        int x, c;
        cin >> x>>c;
        add.push_back({x,c});
        alls.push_back(x);
    }

    for (int i = 0; i < m; i++) {
        int l, r;
        cin >>l>>r;
        query.push_back({l, r});
        alls.push_back(l);
        alls.push_back(r);
    }

    //去重
    sort(alls.begin(), alls.end());
    alls.erase(unique(alls.begin(), alls.end()), alls.end());

    for (auto item : add) {
        int x = find(item.first);
        a[x] += item.second;
    }

    //预处理前缀和
    for (int i = 1; i <= alls.size(); i++) s[i] = s[i-1]+a[i];

    //处理询问
    for (auto item : query) {
        int l = find(item.first), r = find(item.second);
        cout << s[r]-s[l-1]<<endl;
    }

    return 0;
}