#include <bits/stdc++.h>
#define mod 100003
using namespace std;
unordered_map<int, bool>M;
int N, x, t;
int main()
{
    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);
    scanf("%d", &N);
    for(; N; N--)
    {
        scanf("%d%d", &t, &x);
        if(t == 1)
        {
            M[x] = 1;
            continue;
        }
        if(t == 2)
        {
            M[x] = 0;
            continue;
        }
        M[x] ? printf("1\n") : printf("0\n");
    }
    return 0;
}