function dp(price)
{
  string = "" + price;
  number = string.length - string.indexOf('.');
  if (string.indexOf('.') == -1)
    return string + '';
  if (number == 1)
    return string + '00';
  if (number == 2)
    return string + '0';
  if (number > 3)
    return string.substring(0,string.length-number+3);
return string;
}

function calc()
{
  document.getElementById('result').value =
    dp(eval(document.getElementById('c01').value)
    + eval(document.getElementById('c02').value)
    + eval(document.getElementById('c03').value)
    + eval(document.getElementById('c04').value)
    + eval(document.getElementById('c05').value)
    + eval(document.getElementById('c06').value)
    + eval(document.getElementById('c07').value)
    + eval(document.getElementById('c08').value)
    + eval(document.getElementById('c09').value)
    + eval(document.getElementById('c10').value)
    + eval(document.getElementById('c11').value)
    + eval(document.getElementById('c12').value)
    + eval(document.getElementById('c13').value)
    + eval(document.getElementById('c14').value))
}