import java.util.Scanner;
 
class Main {
	int n;
	int[] d;
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		Main m = new Main(sc);
		m.solve();
		sc.close();
	}
	Main(Scanner sc){
		n = sc.nextInt();
		d = new int[n];
		for(int i=0;i<n;i++){
			d[i] = sc.nextInt();
		}
	}
	void solve(){
		boolean[] cnt = new boolean[100];
		for(int i=0;i<n;i++){
			cnt[d[i]-1] = true;
		}
		int dan = 0;
		for(boolean f : cnt){
			if(f) dan++;
		}
		System.out.println(dan);
	}
}
/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