import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int N = stdIn.nextInt();
		int[] flag = new int[101];
		Arrays.fill(flag, 0);
		
		for(int i = 0; i < N; i++) {
			int d = stdIn.nextInt();
			flag[d] = 1;
		}
		
		int ans = 0;
		for(int i = 0; i < 101; i++) {
			ans += flag[i];
		}
		
		System.out.println(ans);

	}

}
/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