int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    int query;
    map<string, int> students;
    cin>>n;
    string name;
    int marks;
    for(int i=0;i<n;i++)
    {
        cin>>query;
        if(query==1)
        {
            cin>>name>>marks;
            students[name]+=marks;
        }
        if(query==2 || query==3)
        {
            cin>>name;
        }
        switch(query)
    {
        case 1: 
        students.insert(make_pair(name,marks)); 
        break;
        
        case 2:
        students.erase(name);
        break;
        
        case 3:
        cout<<students[name]<<"\n";
        break;
    }
    
}
    return 0;
}