#include <bits/stdc++.h>
using namespace std;
int n, tip, x;
set<int> s;
class InParser {
private:
    FILE *fin;
    char *buff;
    int sp;

    char read_ch() {
        ++sp;
        if (sp == 4096) {
            sp = 0;
            fread(buff, 1, 4096, fin);
        }
        return buff[sp];
    }

public:
    InParser(const char* nume){
        fin = fopen(nume, "r");
        buff = new char[4096]();
        sp = 4095;
    }

    InParser& operator >> (int &n) {
        char c;
        while(!isdigit(c = read_ch()) && c != '-');
        int sgn = 1;
        if (c == '-'){
            n = 0;
            sgn = -1;
        } else {
            n = c - '0';
        }
        while(isdigit(c = read_ch())) {
            n = n * 10 + c - '0';
        }

        n *= sgn;
        return *this;
    }

    InParser& operator >> (long long &n) {
        char c;
        n = 0;
        while(!isdigit(c = read_ch()) && c != '-');
        long long sgn = 1;
        if (c == '-'){
            n = 0;
            sgn = -1;
        } else {
            n = c - '0';
        }

        n *= sgn;
        return *this;
    }
};
class OutParser{
private:
    FILE *fout;
    char *buff;
    int sp;

    void write_ch(char ch) {
        if (sp == 50000) {
            fwrite(buff, 1, 50000, fout);
            sp = 0;
            buff[sp++] = ch;
        } else {
            buff[sp++] = ch;
        }
    }

public:
    OutParser(const char* name){
        fout = fopen(name, "w");
        buff = new char[50000]();
        sp = 0;
    }

    ~OutParser() {
        fwrite(buff, 1, sp, fout);
        fclose(fout);
    }

    OutParser& operator << (int vu32) {
        if (vu32 <= 9) {
            write_ch(vu32 + '0');
        } else {
            (*this) << (vu32 / 10);
            write_ch(vu32 % 10 + '0');
        }
        return *this;
    }

    OutParser& operator << (long long vu64) {
        if (vu64 <= 9){
            write_ch(vu64 + '0');
        } else {
            (*this) << (vu64 / 10);
            write_ch(vu64 % 10 + '0');
        }
        return *this;
    }

    OutParser& operator << (char ch) {
        write_ch(ch);
        return *this;
    }

    OutParser& operator << (const char *ch){
        while(*ch){
            write_ch(*ch);
            ++ch;
        }
        return *this;
    }
};
int main() {
    InParser fin("hashuri.in");
    OutParser fout("hashuri.out");

    fin >> n;
    for (int i=1;i<=n;i++){
        fin >> tip >> x;
        if (tip == 1){
            s.insert(x);
        } else if (tip == 2){
            if (s.find(x) != s.end()){
                s.erase(x);
            }
        } else {
            if (s.find(x) != s.end()){
                fout << "1\n";
            }else{
                fout << "0\n";
            }
        }
    }
    return 0;
}