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


int main() {
    map<string, int> students;
    int studentNo, opCode;
    string studentName;
    cin >> studentNo;
    while (studentNo-- > 0) {
        cin >> opCode >> studentName;
        switch(opCode){
            case 1:
                cin >> opCode;
                students[studentName] = students[studentName] + opCode;
                break;
            case 2:
                students.erase(studentName);
                break;
            case 3:
                cout << students[studentName] << '\n'; // Map will create student and assign a default value to marks even if he/she doesn't exist (unlike in Python where it will throw an error)
                break;
        }
    }
    
    return 0;
}