function tryKnapsack($w4, $v4, $maxTake, $i) {
    echo $i;
    if ($i % 2) {
        $vOrw = $v4;
    } else {
        $vOrw = $w4;
    }
    $chosenWeight = 0;
    $m = array();
    $pItems = array();
    list($totVal, $chosenItems) = knapSolveFast2($w4, $vOrw, floor(sizeof($w4)/2)-$i, $maxTake, $m, $pItems);

    foreach($chosenItems as $key) {
        $chosenWeight += $w4[$key];
    }

    if ($chosenWeight > 0 || $i > 10) {
        return $chosenItems;
    } else {
        return tryKnapsack($w4, $v4, $maxTake, $i+1);
    }
}