using System;

public class Program
{
	public static void Main()
	{
		int n = int.Parse(Console.ReadLine());

		int[] array = new int[n];

		for (int i = 0; i<n;i++) {
			array[i]=int.Parse(Console.ReadLine());
		}

		bool numbersAreDifferent = true;

		for (int i = 0; i<n;i++) {
			for (int j = i+1;j<n;j++) {
				if (array[i]==array[j]) {
					numbersAreDifferent = false;
				}
			}
		}

		Console.WriteLine(numbersAreDifferent);
	}
}