#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <map> // insert the header
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    
    int q = 0 , type = 0 , score = 0;
    string name ;
    map<string,int> m ;   
    
    cin >> q ;
    for(int i = 0 ; i < q ; i++)
    {
        cin >> type ;
        
        if(type == 1) 
        {
            cin >> name >> score ;   
            m[name] += score ; 
        }
        else if(type == 2)
        {
            cin >> name ;
            m.erase(name) ;
        }
        else if(type == 3)
        {
            cin >> name ;
            if( m.find(name) == m.end())
            {
                cout << "0\n" ; 
            }
            else
            {
                cout << m[name] << endl ;
            }
        }
    }
    
    
    return 0;
}