#include <iostream>
#include <fstream>
using namespace std;
int n,i,op,x;
char a[1000000000];
int main()
{
    ifstream fin("hashuri.in");
    ofstream fout("hashuri.out");
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>op>>x;
        if(x>=1000000000)x-=1000000000;
        if(op==1)a[x]=1;
        if(op==2)if(a[x]==1)a[x]=0;
        if(op==3){if(a[x]==1)fout<<1<<"\n";
                else fout<<0<<"\n";}
    }
    fin.close();
    fout.close();
    return 0;
}