#include <bits/stdc++.h>

using namespace std;

ifstream fin ("hashuri.in");
ofstream fout ("hashuri.out");

const int MOD=666013;
unordered_map <int,bool> mp;

int main()
{
    int n;
    fin >> n;
    for (int i=1; i<=n; i++)
    {
        int a,b;
        fin >> a >> b;
        if (a==1)
            mp[b]=1;
        else if (a==2)
            mp[b]=0;
        else
            fout << mp[b] << '\n';
    }
    return 0;
}