#include <bits/stdc++.h>

using namespace std;

class parser{
    public:
        parser() {}
        parser(const char *file_name){
            input_file.open(file_name,ios::in | ios::binary);
            input_file.sync_with_stdio(false);
            index&=0;
            input_file.read(buffer,SIZE);}
        inline parser &operator >>(int &n){
            for (;buffer[index]<'0' or buffer[index]>'9';inc());
            n&=0;
            //sign&=0;
            //sign|=(buffer[index-1]=='-');
            for (;'0'<=buffer[index] and buffer[index]<='9';inc())
                n=10*n+buffer[index]-'0';
            //n^=((n^-n)&-sign);
            return *this;}
        ~parser(){
            input_file.close();}
    private:
        fstream input_file;
        static const int SIZE=0x400000; ///4MB
        char buffer[SIZE];
        int index/*,sign*/;
        inline void inc(){
            if(++index==SIZE)
                index=0,input_file.read(buffer,SIZE);}
};

class writer{
    public:
        writer() {};
        writer(const char *file_name){
            output_file.open(file_name,ios::out | ios::binary);
            output_file.sync_with_stdio(false);
            index&=0;}
        inline writer &operator <<(bool target){
            aux&=0;
            /*sign=1;
            if (target<0)
                sign=-1;*/
            n=target;
            if (n==0)
                nr[aux++]='0';
            for (;n;n/=10)
                nr[aux++]=/*(sign**/n/*)*/%10+'0';
            /*if (sign==-1)
                buffer[index]='-',inc();*/
            for(;aux;inc())
                buffer[index]=nr[--aux];
            return *this;}
        inline writer &operator <<(const char *target){
            aux&=0;
            while (target[aux])
                buffer[index]=target[aux++],inc();
            return *this;}
        ~writer(){
            output_file.write(buffer,index);output_file.close();}
    private:
        fstream output_file;
        static const int SIZE=0x200000; ///2MB
        int index,aux,n/*,sign*/;
        char buffer[SIZE],nr[24];
        inline void inc(){
            if(++index==SIZE)
                index&=0,output_file.write(buffer,SIZE);}
};


parser f ("hashuri.in");
writer t ("hashuri.out");

int n;

class hash{
public:
    hash (){};//C-TOR
    void add(unsigned target){
        hashfct(pointer,target);
    FLAG1:
        if (container[pointer]==target){
            flagged[pointer]=false;
            return;
        }
        else if (container[pointer]==0)
            container[pointer]=target;
        else{
            inc();
            goto FLAG1;
        }
    }
    void remov(unsigned target){
        hashfct(pointer,target);
    FLAG2:
        if (container[pointer]==target){
            flagged[pointer]=true;
            return;
        }
        else if (container[pointer]==0)
            return;
        else{
            inc();
            goto FLAG2;
        }
    }
    bool check(unsigned target){
        hashfct(pointer,target);
    FLAG3:
        if (container[pointer]==target and !flagged[pointer])
            return true;
        else if ((container[pointer]==target and flagged[pointer]) or container[pointer]==0) return false;
        else{
            inc();
            goto FLAG3;
        }
    }
    ~hash (){
        memset(container,0,sizeof(container));
    }//D-TOR
private:
    static const int SIZE=10000010,PRIM1=21313,PRIM2=19937;
    unsigned container[SIZE],pointer=0;
    bitset <SIZE> flagged;
    void inc(){
        if (++pointer==SIZE)
            pointer=0;
    }
    void hashfct(unsigned &key,unsigned target){
        key=target%SIZE;
        unsigned mask=0xF0000000;
        key=(1LL*key*PRIM1)%SIZE;
        key=(1LL*key*PRIM2)%SIZE;
        target|=mask;
        target>>=28;
        key<<=4;
        key+=target;
        key%=SIZE;
    }
}h;

void handle(int type,int target){
    if (type==1) h.add(target);
    else if (type==2) h.remov(target);
    else t<<h.check(target)<<"\n";
}

int main(){
    f>>n;
    for (int op,target;n;--n){
        f>>op>>target;
        handle(op,target);
    }
}