import java.util.Scanner;

public class Main {

	public static void main(String args[]) throws Exception {

		Scanner scanner = new Scanner(System.in);
		while (scanner.hasNextLine()) {

			// 输入内存数m、单词总数n
			String str = scanner.nextLine();
			String[] kd = str.split(" ");
			int m = Integer.parseInt(kd[0]);
			int n = Integer.parseInt(kd[1]);

			// 输入单词
			str = scanner.nextLine();
			String[] numstr = str.split(" ");
			int[] Array = new int[numstr.length];
			for (int i = 0; i < numstr.length; i++) {
				Array[i] = Integer.parseInt(numstr[i]);
			}

			// 输出外存查找次数
			fun(Array, m);
			break;
		}

	}

	public static void fun(int[] Array, int m) {
		int[] Memery = new int[m];
		int cnt = 0;// 查找外存次数
		int currentMemryLength = 0;
		for (int i = 0; i < Array.length; i++) {
			if (find(Memery, currentMemryLength, Array[i])) {
				continue;
			} else {
				cnt++;
				if (currentMemryLength < Memery.length) {
					Memery[currentMemryLength++] = Array[i];
				} else {
					for (int j = 1; j < Memery.length; j++) {
						Memery[j - 1] = Memery[j];
					}
					Memery[Memery.length - 1] = Array[i];
				}
			}

		}
		System.out.println(cnt);
	}

	public static boolean find(int[] Memery, int currentMemryLength, int word) {
		for (int i = 0; i < currentMemryLength; i++) {
			if (Memery[i] == word) {
				return true;
			}
		}
		return false;
	}

}

/**************************************************************
	Problem: 2296
	User: admin
	Language: Java
	Result: Accepted
	Time:3752 ms
	Memory:40768 kb
****************************************************************/