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

FILE *f1 = fopen("hashuri.in","r");
FILE *f2 = fopen("hashuri.out","w");

std::map<int,bool> h;

int n,op,el;

int main()
{
    fscanf(f1,"%d",&n);

    while(n--)
    {
        fscanf(f1,"%d%d",&op,&el);

        if(op == 1)
            h[el] = true;

        if(op == 2)
            h[el] = false;

        if(op == 3)
            fprintf(f2,"%d\n",h[el]);
    }

    return 0;
}