import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String args[]) throws IOException {
        HashSet<Integer> valuesSet = new HashSet<Integer>();
        int n;
        List<String> outData = new ArrayList<String>();

        try {
            File file = new File("hashuri.in");
            Scanner scanner = new Scanner(file);
            n = scanner.nextInt();
            for (int i = 0; i < n; i++) {
                int operation = scanner.nextInt();
                int parameter = scanner.nextInt();
                if (operation == 1) {
                    valuesSet.add(parameter);
                }
                if (operation == 2) {
                    valuesSet.remove(parameter);
                }
                if (operation == 3) {
                    if (valuesSet.contains(parameter)) {
                        outData.add("1");
                    } else {
                        outData.add("0");
                    }
                }
            }
            Path out = Paths.get("hashuri.out");
            Files.write(out, outData, Charset.defaultCharset());
            scanner.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}