#include <iostream>
#include <fstream>
#include <unordered_map>
#include <map>
using namespace std;
ifstream fin("hashuri.in");
ofstream fout("hashuri.out");

unordered_map <int, bool> H;

int main()
{
    int n, a, b;
    fin>>n;
    while(n--)
    {
        fin>>a>>b;
        if(a==1)
            H[b]=1;
        if(a==2)
            H[b]=0, H.erase(b);
        if(a==3)
            fout<<H[b]<<"\n";
    }
}