#include <bits/stdc++.h>
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");
int M;
map<int, int>v;
void citire()
{
    int cer, a;
    fin>>M;
    for(int i=1; i<=M; i++)
    {
        fin>>cer>>a;

        if(cer == 1)
        {
            v[a] = 1;
        }
        else
        {
            if (cer == 2)
            {
                v[a] = 0;
            }
            else
            {
                if(v[a] == 1)
                    fout<<"1";
                else
                    fout<<"0";
                fout<<"\n";
            }
        }

    }
}
int main()
{
    citire();
    return 0;
}