#include <iostream>
#include <fstream>
#include <unordered_map>
using namespace std;

unordered_map<int,bool>ap;

int main()
{
    int i,op,x,n;
    ifstream f("hashuri.in");
ofstream g("hashuri.out");
    f>>n;
    for(i=1; i<=n; i++)
    {
        f>>op>>x;
        if(op==1)
            ap[x]=1;
        if (op==2)
            ap[x]=0;
        if(op==3)
            g<<ap[x]<<"\n";
    }
    return 0;
}