#include <iostream>
#include <vector>
#include <map>

using namespace std;

#define int long long

// {тип вагона, количество}
vector<pair<string, int>> train;

signed main() {
  int n, length = 0, count;
  cin >> n;
  map<string, int> m;
  for (int op = 0; op < n; ++op) {
    string txt, name;
    cin >> txt;
    if (txt == "add") {
      cin >> count >> name;
      m[name] += count;
      train.push_back({name, count});
    } else if (txt == "delete") {
      cin >> count;
      while (!train.empty() and count > 0) {
        if (train.back().second > count) {
          m[train.back().first] -= count;
          train.back().second -= count;
          break;
        }
        m[train.back().first] -= train.back().second;
        count -= train.back().second;
        train.pop_back();
      }
    } else if (txt == "get") {
      cin >> name;
      cout << m[name] << endl;
    }
  }
}