import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int[] d = new int[N];
        for(int i = 0; i < N; i++) d[i] = sc.nextInt();

        //餅を昇順に並び替える
        Arrays.sort(d);
      
        //同じサイズの餅があれば、一方を0（削除）とする。
        for(int i = 0; i < N - 1; i++){
            if(d[i] == d[i+1]) d[i] = 0;
        }
        //０でない餅をカウント
        int count = 0;
        for(int i = 0; i < N; i++){
            if(d[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