#include<cstdio>
#include<string>
#include<vector>

using namespace std;

#ifdef HOME
const string inputFile = "input.txt";
const string outputFile = "output.txt";
#else
const string problemName = "hashuri";
const string inputFile = problemName + ".in";
const string outputFile = problemName + ".out";
#endif

const int MOD = 666013;

int N;
vector<int> V[MOD + 5];

void add(int x) {
    int r = x % MOD;

    for(auto y : V[r])
        if(y == x)
            return;

    V[r].push_back(x);
}

void erase(int x) {
    int r = x % MOD;

    for(auto &y : V[r])
        if(y == x) {
            swap(y, V[r].back());
            V[r].pop_back();
            return;
        }
}

int find(int x) {
    int r = x % MOD;

    for(auto y : V[r])
        if(y == x)
            return 1;

    return 0;
}

int main() {
    int t, x;

    freopen(inputFile.c_str(), "r", stdin);
    freopen(outputFile.c_str(), "w", stdout);

    scanf("%d", &N);

    while(N--) {
        scanf("%d%d", &t, &x);

        if(t == 1) {
            add(x);
            continue;
        }

        if(t == 2) {
            erase(x);
            continue;
        }

        if(t == 3) {
            printf("%d\n", find(x));
            continue;
        }
    }

    return 0;
}