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


int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    map<string, int> answer_sheet;
    int queries, type, y;
    string x;
    cin >> queries;
    for (int i = 0; i < queries; i++) {
        cin >> type >> x;
        auto it = answer_sheet.find(x);
        if (type == 1) {
            cin >> y;
            if (it == answer_sheet.end()) {
                answer_sheet.insert({x, y});
            } else {
                answer_sheet[x] += y;
            }
        } else if (type == 2) {
            if (it == answer_sheet.end()) {
                answer_sheet.insert({x, 0});
            } else {
                answer_sheet[x] = 0;
            }
        } else {
            if (it == answer_sheet.end()) {
                cout << "0\n";
            } else {
                cout << answer_sheet[x] << "\n";
            }
        }
    }
    return 0;
}