#include <vector>
#include <iostream>
#include <list>

using namespace std;
int main()
{
    size_t n;
    cin>>n;
    std::vector<int> b;
    int sum = 0;
    std::vector<int> result;
    for(size_t i = 0 ; i != n ; ++i)
    {
        char a;
        int t;
        std::cin>>a>>t;
        sum += t;
        if(a == '+')
            b.push_back(t);
        else if (a == '-')
        {
            for(int i =0 ; i < b.size(); ++i)
            {
                if(b[i] == t)
                    b[i] = 0;
            }
        }
        else
        {
            int  cnt = 0;
            bool check = false;

            for(auto  c : b)
            {
                if(t <= c)
                {
                    cnt++;
                    check = true;
                }

            }
            if(check == false && sum> t)
            {
                cnt++;
            }
            result.push_back(cnt);
        }
        for(auto a: result)
            cout<<a<<"\n";
    }


}