import java.util.*;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
        int[] diameter;
        int step = 0;
        int massdia = 0;
		
        int cnt = sc.nextInt();
        diameter = new int[cnt];
        
        for(int i = 0; i < cnt; i++){
            diameter[i] = sc.nextInt();
        }
        
        int[] sort;
        sort = Arrays.stream(diameter).distinct().toArray();
        
        
        System.out.println(sort.length);
	}
}
/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