#include<iostream>
#include<cstring>
#include<cstdio>
#include<vector>
#include<algorithm>
using namespace std;
typedef pair<int,int> PII;
const int N=300010;
int n,m;
int a[N],s[N];
vector<int>alls;     //alls数组去记录所有地址并去重  有地址无value的则为0
vector<PII>add,query;     //add去record每个address x和相对应的value c query去打包一组l r
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;
}
int main(){

    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);
    }
    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;    //给a数组赋值 构造前缀和
    }
    for(int i=1;i<=alls.size();i++) s[i]=s[i-1]+a[i];
    for(auto item:query){
        int l=find(item.first),r=find(item.second);
        cout<<s[r]-s[l-1]<<endl;
    }
    return 0;

}