//package hashuri;

import java.io.*;
import java.util.*;

public class Main {
	private static final int MOD = 666013;
	
	public static void main(String[] args) throws IOException {
		InputReader in = new InputReader(new FileInputStream("hashuri.in"));
		PrintWriter out = new PrintWriter(new FileOutputStream("hashuri.out"));
		
		new Main().solve(in, out);
		out.close();
	}
	
	public void solve(InputReader in, PrintWriter out) {
		int N = in.nextInt();
		HashSet hash = new HashSet();
		
		while (N-- > 0) {
			int op = in.nextInt();
			int value = in.nextInt();
			
			if (op == 1)
				hash.Insert(value);
			else if (op == 2)
				hash.Erase(value);
			else {
				if (hash.Check(value))
					out.println("1");
				else
					out.println("0");
			}
		}
	}
	
	class HashSet {
		private ArrayList<LinkedList<Integer>> hash_table = new ArrayList<LinkedList<Integer>>();
		
		HashSet() {
			for (int i = 0; i < MOD; ++i)
				hash_table.add(new LinkedList<Integer>());
		}
		
		public void Insert(int value) {
			int key = value % MOD;
			for (int it: hash_table.get(key))
				if (it == value)
					return;
			hash_table.get(key).add(value);
		}
		
		public boolean Check(int value) {
			int key = value % MOD;
			for (int it: hash_table.get(key))
				if (it == value)
					return true;
			return false;
		}
		
		public void Erase(int value) {
			int key = value % MOD;
			for (int it: hash_table.get(key))
				if (it == value) {
					hash_table.get(key).remove((Object)it);
					return;
				}
		}
	}

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;
 
        public InputReader(InputStream stream) {
            this.stream = stream;
        }
 
        public int read() {
            if (numChars == -1)
                throw new UnknownError();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new UnknownError();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }
 
        public int peek() {
            if (numChars == -1)
                return -1;
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    return -1;
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar];
        }
 
        public void skip(int x) {
            while (x-- > 0)
                read();
        }
 
        public int nextInt() {
            return Integer.parseInt(next());
        }
 
        public long nextLong() {
            return Long.parseLong(next());
        }
 
        public String nextString() {
            return next();
        }
 
        public String next() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            StringBuffer res = new StringBuffer();
            do {
                res.appendCodePoint(c);
                c = read();
            } while (!isSpaceChar(c));
 
            return res.toString();
        }
 
        public String nextLine() {
            StringBuffer buf = new StringBuffer();
            int c = read();
            while (c != '\n' && c != -1) {
                if (c != '\r')
                    buf.appendCodePoint(c);
                c = read();
            }
            return buf.toString();
        }
 
        public double nextDouble() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            double res = 0;
            while (!isSpaceChar(c) && c != '.') {
                if (c == 'e' || c == 'E')
                    return res * Math.pow(10, nextInt());
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = read();
            }
            if (c == '.') {
                c = read();
                double m = 1;
                while (!isSpaceChar(c)) {
                    if (c == 'e' || c == 'E')
                        return res * Math.pow(10, nextInt());
                    if (c < '0' || c > '9')
                        throw new InputMismatchException();
                    m /= 10;
                    res += (c - '0') * m;
                    c = read();
                }
            }
            return res * sgn;
        }
 
        public boolean hasNext() {
            int value;
            while (isSpaceChar(value = peek()) && value != -1)
                read();
            return value != -1;
        }
 
        private boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
    }
}