#include <bits/stdc++.h>

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

map <int,int> m;

int i, j, n, x, op, k, sf, sff, in, p;

int main()
{
    fin>>n;
    for(i=1; i<=n; i++)
    {
        fin>>op>>x;
        if(op == 1)
            m[x]=1;
        if(op == 2)
            m[x]=0;
        if(op == 3)
        {
            if(m[x] == 1)
                fout<<1<<endl;
            else fout<<0<<endl;
        }
    }
}