#include <stdio.h>

#define NMax 1000005

int N, M[NMax], sz;

inline int find_value(int x)
{
    int i;

    for (i = 0; i < sz; ++i)
        if (M[i] == x)
            return i;
    return -1;
}

inline void insert_value(int x)
{
    if (find_value(x) == -1)
        M[sz++] = x;
}

inline void erase_value(int x)
{
    int i, p = find_value(x);

    if (p == -1)
        return ;
    for (i = p; i < sz-1; ++i)
        M[i] = M[i+1];
    --sz;
}

int main()
{
    int op, x;

    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);

    for (scanf("%d", &N); N; --N)
    {
        scanf("%d %d", &op, &x);
        if (op == 1)
        {
            insert_value(x);
            continue;
        }
        if (op == 2)
        {
            erase_value(x);
            continue;
        }
        printf("%d\n", find_value(x) != -1);
    }

    return 0;
}