#include <bits/stdc++.h>
#define MOD 666013
#define MAXN 1000000

#define BUF_SIZE 1 << 14
char buf[BUF_SIZE];
int pbuf=BUF_SIZE;
FILE*fi,*fo;
inline char nextch(){
    if(pbuf==BUF_SIZE){
        fread(buf, BUF_SIZE, 1, fi);
        pbuf=0;
    }
    return buf[pbuf++];
}
inline int nextnum(){
    int a = 0;
    char c = nextch();
    while(!isdigit(c))
        c = nextch();
    while(isdigit(c)){
        a = a * 10 + c - '0';
        c = nextch();
    }
    return a;
}
class Hash{
    public:
    int k=0, next[MAXN+1], *lista;
    int val[MAXN+1];
    int d[MAXN+1];
    Hash() {
        lista = new int[MOD];
        memset(lista, 0x00, MOD*sizeof(int));
    }
    inline void insert(int element, int frecventa){
        k++;
        val[k]=element;
        d[k]=frecventa;
        next[k]=lista[element%MOD];
        lista[element%MOD]=k;
    }
    inline void erase(int element){
        int p=lista[element%MOD];
        if(p==0)
            return ;
        if(val[p]==element){
            lista[element%MOD]=next[lista[element%MOD]];
            return ;
        }
        while(next[p]!=0 && val[next[p]]!=element)
            p=next[p];
        if(next[p]!=0){
            next[p]=next[next[p]];
        }
    }
    inline int find(int element){
        int p=lista[element%MOD];
        while(p!=0 && val[p]!=element)
            p=next[p];
        if(p!=0)
            return p;
        return 0;
    }
} H;

int main(){
    fi=fopen("hashuri.in","r");
    fo=fopen("hashuri.out","w");
    int n=nextnum();
    for(int i=0;i<n;i++){
        int c=nextnum();
        int val=nextnum();
        if(c==1){
            if(!H.find(val))
                H.insert(val, 1);
        }
        else if(c==2)
            H.erase(val);
        else{
            if(H.find(val))
                fprintf(fo,"1\n");
            else
                fprintf(fo,"0\n");
        }
    }
    fclose(fi);
    fclose(fo);
    return 0;
}