#include <iostream>
#include <stdio.h>
#include <map>

using namespace std;

map <int, int> mymap;

int main()
{
    FILE *fin = fopen("hashuri.in", "r");
    FILE *fout = fopen("hashuri.out", "w");
    int n, i, t, x;
    fscanf(fin, "%d", &n);

    for(i=0; i<n; i++) {
        fscanf(fin, "%d%d", &t, &x);

        if(t==1)
            mymap[x] = 1;
        else if(t==2)
            mymap[x] = 0;
        else
            fprintf(fout, "%d\n", mymap[x]);
    }

    fclose(fin);
    fclose(fout);
    return 0;
}