function sanityInput(input) {
	return input.replace(/[^0-9.,]/g, '').replace(/\,+/g, '.');
}

function sanityOutput(output) {
	return output.replace(/\.+/g, ',');
}

function calculateUnits(koef) {
	var koef = sanityInput(koef);
	var requiredUnits = sanityInput($('#req-ks').val());
	$('#kosik-ks').val( Math.ceil(requiredUnits / koef) * koef );
}