import java.util.*;
import java.util.stream.*;
import static java.lang.System.*;
import java.io.*;

class Main {
//	static Scanner sc = new Scanner(System.in);
	static int maxInt = Integer.MAX_VALUE;
	static int minInt = Integer.MIN_VALUE;
//	static int nextInt () {return Integer.parseInt(sc.next());}
//	static int[] nextIntArray (int n) {return IntStream.range(0,n).map(i->nextInt()).toArray();}
	static int max (int... ar) {Arrays.sort(ar);return ar[ar.length-1];}
	static int min (int... ar) {Arrays.sort(ar);return ar[0];}


	static FastScanner sc = new FastScanner();
	public static void main(String[] args) {
		//MAIN----------------------------------------------------------

		int n = sc.nextInt();
		HashMap<Integer, Integer> map = new HashMap<>();
		for (int i=0; i<n; i++) {
			int temp = sc.nextInt();
			map.put(temp, map.getOrDefault(temp,0)+1);
		}
		
		int ans = 0;
		for (Map.Entry<Integer, Integer> e: map.entrySet()) {
			if (e.getValue() == 1) ans++;
		}
		out.println(ans);
		
		//--------------------------------------------------------------
	}
}


class FastScanner {
	private InputStream in = System.in;
	private byte[] buffer = new byte[10];
	private int length = 0;
	private int p = 0;

	boolean hasNextByte () {
		if (p < length) return true;
		else {
			p = 0;
			try {length = in.read(buffer);}
			catch (Exception e) {e.printStackTrace();}
			if (length == 0) return false;
		}
		return true;
	}

	int readByte () {
		if (hasNextByte() == true) return buffer[p++];
		return -1;
	}

	boolean isPrintable (int n) {return 33<=n&&n<=126;}
	void skip () {
		while (hasNextByte() && !isPrintable(buffer[p])) p++;
	}
	boolean hasNext () {skip(); return hasNextByte();}

	String next () {
		if (!hasNext()) throw new NoSuchElementException();
		StringBuilder sb = new StringBuilder();
		int temp = readByte();
		while (isPrintable(temp)) {
			sb.appendCodePoint(temp);
			temp = readByte();
		}
		return sb.toString();
	}

	public int nextInt () {
		long n = nextLong();
		if (n<Integer.MIN_VALUE || Integer.MAX_VALUE<n) {
			throw new ArithmeticException();
		}
		return (int) n;
	}

	public int[] nextInts (int n) {
		int[] ar = new int[n];
		for (int i=0; i<n; i++) ar[i] = nextInt();
		return ar;
	}

	public long nextLong () {
		if (!hasNext()) throw new NoSuchElementException();
		boolean minus = false;
		int temp = readByte();
		if (temp == '-') {
			minus = true;
			temp = readByte();
		}
		if (temp<'0' || '9'<temp) throw new NumberFormatException();
		long n = 0;
		while (isPrintable(temp)) {
			if ('0'<=temp && temp<='9') {
				n *= 10;
				n += temp - '0';
			}
			else throw new NumberFormatException();
			temp = readByte();
		}
		return minus? -n : n;
	}
}