using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var s = ReadLine().ToList();
        s.Sort();
        for (var i = 0; i + 1 < s.Count; ++i)
        {
            if (s[i] == s[i + 1])
            {
                WriteLine("Yes");
                return;
            }
        }
        WriteLine("No");
    }
}