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[] mochiArray = new int[n];
		for(int i =0;i <n;i++) {
			mochiArray[i] = sc.nextInt();
		}
		Arrays.sort(mochiArray);
		int answer = 1;
		for(int i =1;i <n;i++) {
			if(mochiArray[i] == mochiArray[i-1]) {
				continue;
			}else {
				answer++;
			}
		}
		System.out.println(answer);
	}
}
/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