import java.util.Arrays;
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner stdIn=new Scanner(System.in);
		int N=stdIn.nextInt();
		int a[]=new int[N];
		int z=0,y=1;
		while(z<N){
			a[z]=stdIn.nextInt();
			z++;
		}z=0;
		Arrays.sort(a);
		while(z<N-1){
			if(a[z]!=a[z+1])
				y++;
			z++;
		}
		System.out.println(y);
	}
}

/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