import java.io.*;
import java.util.*;
 
public class Main {
	private static final String INPUT_FILE_PATH = "hashuri.in";
	private static final String OUTPUT_FILE_PATH = "hashuri.out";
 
	public static void main(String[] args) throws IOException {
		Scanner in = new Scanner(new FileReader(INPUT_FILE_PATH));
		PrintWriter out = new PrintWriter(OUTPUT_FILE_PATH);
		int n = in.nextInt();
		Set<Integer> hash = new HashSet<>();
		while (n-- > 0) {
			int opType = in.nextInt();
			int val = in.nextInt();
			switch (opType) {
			case 1:
				hash.add(val);
				break;
			case 2:
				if (hash.contains(val)) {
					hash.remove(val);
				}
				break;
			case 3:
				out.println((hash.contains(val) ? 1 : 0));
				break;
			}
		}
		out.flush();
		in.close();
		out.close();
	}
 
}