map<string,int> studentMarks;
int n,query,marks;
cin >> n;
string name;

for(int i=0; i<n; ++i){
    cin >> query;

    if(query == 1){
        cin >> name >> marks;
        studentMarks[name] += marks;
    }
    else if(query == 2){
        cin >> name;
        studentMarks.erase(name);
    }
    else if(query == 3){
        cin >> name;
        if(studentMarks.find(name) != studentMarks.end()){
            cout << studentMarks[name];
        }
        else{
            cout << 0;
        }
    }
}