#include <fstream>
#include <unordered_map>
using namespace std;
ifstream in("hashuri.in");
ofstream out("hashuri.out");
unordered_map <int,int> ma;
int n,i,a,b;
int main()
{
    ios_base::sync_with_stdio(NULL);
    in.tie();
    out.tie();
in>>n;
for (i=1;i<=n;++i)
{
    in>>a>>b;
    if (a==1) ma[b]=1;
    if (a==2) ma[b]=0;
    if (a==3) out<<ma[b]<<'\n';
}
    return 0;
}