using System;
using System.Diagnostics;

public class Test
{
    private static Random random = new Random();
    private static double[] radnomTable(int n) {
        double[] result = new double[n];
        for(int i=0; i<n; ++i)
            result[i] = random.NextDouble();
        return result;
    }
    
    private static double GetAverage(double[] tab) {
        double sum = 0;
        foreach(double x in tab)
            sum += x;
        return sum/tab.Length;
    }

    public static void Main()
    {
        string s;
        while ((s = Console.ReadLine())!=null) {
            int n = int.Parse(s);
            double[] tab = radnomTable(n);
            
            for(int i=0; i<5; ++i) {
                Stopwatch sw = new Stopwatch();
                sw.Start();
                double avr = GetAverage(tab);
                sw.Stop();
                double nanoseconds = 1e9*sw.ElapsedTicks/Stopwatch.Frequency;
                Console.WriteLine("{0,8}:{1}: average={2:F6} time={3}ns", n, i+1, avr, nanoseconds);
            }
        }
    }
}