int main() {
    int q; cin >> q;
    string name;
    map<string,int> notes;
    for(int i(0),type(0),note(0) ; i<q ; ++i)
    {
        cin>>type>>name;
        switch(type)
        {
            case 1:{
                cin>>note;
                notes[name] += note;
                break;
            }
            case 2:
                notes[name] = 0;
                break;
            case 3:
                cout << notes[name] << endl;
                break;
        }
    }
    return 0;
}