ochered

#include <vector>
#include <iostream>
#include <string>
#include <cmath>

using namespace std;

void vivodworry(const vector<bool>& vec) {
    for (auto g : vec) {
        cout << g;
    }
    cout << endl;
}

int main()
{
    int i, j, n, m, count, r, size = 0;
    string comand;
    vector<bool> worry;
    vector<int> vivod;
    cin >> n;

    for (i = 0; i < n; i++) {
        cin >> comand;
        if (comand == "COME") {
            cin >> m;
            if (m >= 0) {
                for (j = 0; j < m; j++) {
                    worry.push_back(false);
                }
            }
            else {
                for (j = 0; j < abs(m); j++) {
                    size = worry.size() - 1;
                    worry.erase(worry.begin() + size);
                }
            }
        }
        else if (comand == "WORRY") {
            cin >> m;
            worry[m] = true;
        }
        else if (comand == "QUITE") {
            cin >> m;
            worry[m] = false;
        }
        else if (comand == "WORRY_COUNT") {
            size = worry.size();
            int count = 0;
            for (j = 0; j < size; j++) {
                if (worry[j] == true)
                    count += 1;
            }
            vivod.push_back(count);
            count = 0;
        }
    }
    for (auto c : vivod) {
        cout << c << endl;
    }
    return 0;
}