import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
	int n=sc.nextInt();
	int a[]=new int[n];
	for(int i=0;i<=n-1;i++){
		a[i]=sc.nextInt();
	}
Arrays.sort(a);
int sam=0;
for(int i=0;i<=n-2;i++){
if(a[i]==a[i+1]){
	sam++;
}
}System.out.println(n-sam);
	}}
/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