#include <bits/stdc++.h>
using namespace std;

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

/**
7
1 3
1 20
2 7
3 4
3 20
2 20
3 20
a=3,20;

*/

set<int> a;

int main()
{
    int n,i,c,x;
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>c>>x;
        if(c==1)    a.insert(x);
        else if(c==2) a.erase(x);
        else if(a.find(x)!=a.end()) fout<<"1\n";
            else fout<<"0\n";
    }
    return 0;
}