import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Main {
public static void main(String[]srgs) {
	Scanner scan=new Scanner(System.in);
	List<Integer> list=new ArrayList<Integer>();
	int a=scan.nextInt();
	for(int i=0;i!=a;i++) {
		int b=scan.nextInt();
		if(!list.contains(b)) {
			list.add(b);
		}
	}
	System.out.println(list.size());
	scan.close();
}
}
/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