import java.util.*;
import static java.lang.Math.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);

		// 入力
		int n = sc.nextInt();// N

		ArrayList<Integer> numList = new ArrayList<Integer>();
		for(int i = 0; i < n; i++){
			int value = sc.nextInt();
			if(!numList.contains(value)){
				numList.add(value);
			}
		}

		// 出力
		System.out.println(numList.size());
	}
}



/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz