using System;

public class Program

{

    public static void Main()

    {

        int size = 131;

        int collisions = 8;

        Random random = new Random();

        int[] buckets = new int[size];

        for (int i = 0; i < size * collisions; i++) {

            int hash = random.Next().GetHashCode();

            int bucket = hash % size;

            buckets[bucket]++;

        }

        int diff = 0;

        for (int i = 0; i < size; i++) {

            diff += Math.Abs(buckets[i] - collisions);

            //Console.WriteLine("buckets[" + i + "] = " + buckets[i]);

        }

        Console.WriteLine("diff = " + diff);

    }

}