import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		try {
			InputStreamReader isr = new InputStreamReader(System.in);
			BufferedReader br = new BufferedReader(isr);

			int num = Integer.parseInt(br.readLine());
			ArrayList<Integer> list = new ArrayList<Integer>();

			int answer = 0;

			for (int i = 0; i < num; i++) {
				list.add(Integer.valueOf(br.readLine()));
			}

			Collections.sort(list, Collections.reverseOrder());

			Integer mochiLen = 0;
			for (Integer integer : list) {
				if (!integer.equals(mochiLen)) {
					answer++;
					mochiLen = integer;
				}
			}

			System.out.println(answer);
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
	}

}

/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