gistfile1.txt

<script>

  var first_number = prompt('Please enter first value','');
  var second_number = prompt('Please enter second value','');
  var i;
  var maxCount = 1;

  for(i = first_number; i <= second_number; i ++)
  {
    var number = i;

      if (counter > maxCount)
     {
        maxCount = counter;
     }
 var counter = 1;

     while(number != 1)
     {
       if(number%2 == 1)
        {
           number = (number*3+1);
        }
        else
        {
           number = number/2;
        }
         counter++;
     }
  }

    document.write(first_number+ ' to ' + second_number + ' Maximum count  ' + maxCount);


    </script>