#include <bits/stdc++.h>

using namespace std;

FILE *F=fopen("hashuri.in", "r"), *G=fopen("hashuri.out", "w");

int v[1000003], p,x, y, n, L[666014], nxt[1000003];
const int MOD = 666013;

inline void adaug(int p, int x)
{
    v[p] = x;
    nxt[p] = L[x%MOD];
    L[x%MOD] = p;
}

inline int caut(int x)
{
    p = L[x%MOD];
    while(p)
        if(v[p] == x) return 1;
        else p = nxt[p];
    return 0;
}

inline void sterg(int x)
{
    p = L[x%MOD];
    if(v[p] == x)
        L[x%MOD] = nxt[L[x%MOD]];
    else
    {
        while(nxt[p])
            if(v[nxt[p]] == x)
            {nxt[p] = nxt[nxt[p]];break;}
            else p = nxt[p];
    }
}

int main()
{
    fscanf(F, "%d ", &n);
    for(int i = 0; i < n; ++ i)
    {
        fscanf(F, "%d%d ", &x, &y);
        if(x == 1){if(!caut(y)) adaug(i, y);}
        else if(x == 3) fprintf(G, "%d\n", caut(y));
        else if(caut(y)) sterg(y);
    }
    return 0;
}