import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc  = new Scanner(System.in);
      	int n = sc.nextInt();
      	int[] d = new int[n];
      	int[] mochi = new int[101];
      	for(int i = 0 ; i < n; i++){
        	d[i] = sc.nextInt();
          	mochi[d[i]]++;
        }
      	int count = 0;
      	for(int i = 0; i <= 100; i++){
        	if(mochi[i] > 0) count++;
        }
      	System.out.println(count);
    }
}
/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