<?php
// No. 152

$l = trim(fgets(STDIN));

$sum = floor($l / 4);
$count = 0;

$p = 2;
$q = 1;
$count = 0;
while ((2*$p*($p+$q)) <= $sum) {


  while ($p > $q) {
    if (getGCD($p, $q) == 1) {
      $a = pow($p, 2) - pow($q, 2);
      $b = 2 * $p * $q;
      $c = pow($p, 2) + pow($q, 2);

      $count++;
    }

    $q += 2;
    if ((2*$p*($p+$q)) > $sum) break;
  }
  $p++;
  $q = 1 + ($p % 2);
}

echo $count.PHP_EOL;
return;

// ---------------------- //
function getGCD($a, $b)
{
  if ($a < $b) {
    return getGCD($b, $a);
  }
  else {
    $m = $a % $b;
    return ($m == 0) ? $b : getGCD($b, $m);
  }
}