#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <map>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int t;
    cin>>t;
    map<string,int>mp;
    while(t--){
        int a;
        cin>>a;
        string s;
        cin>>s;
        if(a==1){
            int marks;
            cin>>marks;
            auto it=mp.find(s);
            if(it!=mp.end()){
                mp[s]+=marks;
            }else{
                mp.insert(make_pair(s,marks));
            }
        }
        if(a==2){
            mp.erase(s);
        }
        if(a==3){
            if(mp.find(s)!=mp.end()){
                cout<<mp[s]<<endl;
            }else{
                cout<<0<<endl;
            }
        }
    }
    return 0;
}