#include <fstream>
#include <bitset>
#define NMAX 2000000001

using namespace std;

bitset <NMAX> h;

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

char c;
int n, a;

int main()
{
    fin >> n;
    while(n--)
    {
        fin >> c >> a;
        if(c == '1') h[a] = 1;
        else if(c == '2') h[a] = 0;
        else fout << h[a] << "\n";
    }
    return 0;
}