<p>using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Xml;
using System.Text.RegularExpressions;

public interface IMathUtilities
{
  int HammingWeight(int value);
}

public class Solution : IMathUtilities
{
  public int HammingWeight(int value)
  {
    int sum = 0;
    
    while(value &gt; 0) {
      sum += value &amp; 0x01;
      value &gt;&gt;= 1;
    }
    
    return sum;
  }
}

</p>