385/а

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _385a
{
	class Program
	{
		static void Main(string[] args)
		{
			double k = double.Parse(Console.ReadLine());
			double sum = 0;
			int count = 0;


			while (k !=0)
			{
				double num = double.Parse(Console.ReadLine());

				if (num == 0)
				{
					k = 0;
				}

				else if (num > k)
				{
					count++;
					sum += num;


				}

			}
			Console.WriteLine(sum/count);
		}
	}
}