using System;
using System.Text;
 
public static class StringExtensions
{
    public static string Repeat(this string input, int count)
    {
        if (input == null)
        {
            return null;
        }
 
        var sb = new StringBuilder();
 
        for (var repeat = 0; repeat < count; repeat++)
        {
            sb.Append(input);
        }
 
        return sb.ToString();
    }
}
 
public class Test
{
	public static void Main()
	{
		Console.Out.WriteLine("Hello".Repeat(3));
	}
}

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