package main;

import java.io.File;
import java.util.Scanner;

public class Fake {

	public static void main(String[] args) throws Throwable {
		File file = new File("txt");
		Scanner scan = new Scanner(file);
		int N, M, c;
		while (true) {
			N = scan.nextInt();
			M = scan.nextInt();
			if ((N < 1 || N >= 1000) || (M < 1 || M >= 1000))
				break;
			int num[] = new int[N];
			for (int i = 0; i < M; i++)
				num[scan.nextInt() - 1]++;
			c = 0;
			for (int i = 0; i < N; i++)
				if (num[i] > 1)
					c++;
			System.out.println(c);
		}
	}
}