#include <bits/stdc++.h>

using namespace std;

ifstream f("hashuri.in");
ofstream g("hashuri.out");

int n,i,j,x,nr;
unordered_map<int,bool> v;

int main()
{
    f>>n;
    for(i=1;i<=n;i++)
    {
        f>>x>>nr;
        if(x==1)
            v[nr]=1;
        if(x==2)
            v[nr]=0;
        if(x==3)
            g<<v[nr]<<"\n";
    }
    return 0;
}