Way to hash map string to int in weighted hash manner

StringToIntWeightedHash.cs

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

namespace TestBench
{
    class Program
    {
        static void Main(string[] args)
        {
            int listCount = 1000000;
            int bucketSize = 10;
            string prefix = "prefix";
            SortedDictionary<int, int> histogram = new SortedDictionary<int, int>();

            for (int i = 0; i < listCount; i++)
            {
                int k = GetHash(prefix + i.ToString(), bucketSize);
                if (histogram.ContainsKey(k))
                {
                    histogram[k]++;
                }
                else
                {
                    histogram[k] = 1;
                }
            }

            foreach (KeyValuePair<int, int> pair in histogram)
            {
                Console.WriteLine("{0}\t\t{1}\t\t{2}", pair.Key, pair.Value, (float)((float)pair.Value / (float)listCount));
            }

            Console.ReadKey();
        }

        static int GetHash(string s, int max)
        {
            int k = Math.Abs(s.GetHashCode() % max);
            if (k <= 3)
            {
                return 0;
            }
            else if (k <= 6)
            {
                return 1;
            }
            else if (k <= 8)
            {
                return 2;
            }

            return 3;
        }
    }
}