import java.util.*;

public class Main {

	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		int count = scn.nextInt();
		int[] mochi = new int[count];
		for (int i = 0; i < count; i++) {
			 mochi[i] = scn.nextInt();
		}
		//int[] mochiSort = new int[count];
		Arrays.sort(mochi);
		int total = 0;
		int tmp = 0;
		for (int i = 0; i < mochi.length; i++) {
			if(tmp != mochi[i] ) {
				tmp = mochi[i];
				total++;
			}
		}
		System.out.println(total);

	}

}

/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