#include <cstdio>
#include <unordered_map>

using namespace std;

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

    int n, x, type;
    unordered_map<int, bool> H;

    scanf("%d", &n);

    for (int i = 1; i <= n; i++) {
        scanf("%d %d", &type, &x);
        switch (type) {
        case 1:
            H[x] = true;
            break;
        case 2:
            H[x] = false;
            break;
        case 3:
            printf("%d\n", H[x]);
            break;
        }
    }

    return 0;
}