import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int D[] = new int[N];
		for(int i=0; i<N; i++) {
			D[i] = sc.nextInt();
		}
		Arrays.sort(D);
		int count = 1;
		for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		}
		System.out.println(count);
		sc.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