using System;

public class Program {
	public static void Main(string[] args) {
		Console.ReadLine(); // n
		string[] s = Console.ReadLine().Split(' ');
		
		int count = 0;
		for (int i = 0; i < s.Length; i++) {
			bool isSame = false;
			for (int j = 0; j < s.Length; j++) {
				if (i == j) {
					continue;
				} else if (s[i].Equals(s[j])) {
					isSame = true;
					break;
				}
			}
			if (!isSame) {
				count++;
			}
		}
		
		Console.WriteLine(count);
	}
}