#include <iostream>
#include <fstream>
#include <vector>

const int MOD=666707;
std::vector<int> v[MOD];

std::ifstream in("hashuri.in");
std::ofstream out("hashuri.out");

int main()
{
    int n, tip, x;
    in>>n;
    for(int i=1; i<=n; i++)
    {
        in>>tip>>x;

        switch(tip)
        {
        case 1:
        {
            int loc=x%MOD;
            bool ok=false;
            for(int contor=0; contor<v[loc].size(); contor++)
            {
                if(v[loc][contor]==x)
                {
                    ok=true;
                    break;
                }
            }
            if(ok==false)
            {
                v[loc].push_back(x);
            }
            break;
        }
        case 2:
        {
            int loc=x%MOD;
            for(int contor=0; contor<v[loc].size(); contor++)
            {
                if(v[loc][contor]==x)
                {
                    v[loc].erase(v[loc].begin()+contor);
                    break;
                }
            }
            break;
        }

        case 3:
        {
            int loc=x%MOD;
            bool ok=0;
            for(int contor=0; contor<v[loc].size(); contor++)
            {
                if(v[loc][contor]==x)
                {
                    out<<1<<"\n";
                    ok=true;
                }
            }
            if(ok==false)
            {
                out<<0<<"\n";
            }
            break;
        }
        }
    }
}