#include <iostream>
#include <cstdio>
#include <map>

using namespace std;

map<int, int> h;

int main()
{
    freopen("hashuri.in", "r", stdin);
    freopen("hashuri.out", "w", stdout);
    int n;
    scanf("%d", &n);
    for(int i = 0; i < n; ++i)
    {
        int op, nr;
        scanf("%d", &op);
        scanf("%d", &nr);
        switch(op)
        {
            case 1:
            h[nr] = 1;
            break;
            case 2:
            h[nr] = 0;
            break;
            case 3:
            printf("%d\n", h[nr]);
            break;
            default:
            break;
        }
    }
    return 0;
}