function calculate_price(multiplier) {
	document.write(Math.ceil(30.2385 * multiplier ));
}

function calculate_discount_price(multiplier,discount) {
	return (Math.ceil(multiplier * (100-discount)/100));
}


function calc(price,add)
{
	x=Math.ceil(30.2385 * price + add);
	x=Math.ceil(x*1.09);
	document.write(x);
}

function calc_euro(multiplier) {
	document.write(Math.ceil(39.7425 * multiplier * 1.000));
}

function calculate(curr_price, currency, multiplier, rub_addition) {

	rub_rate		= currency == "eur" ? 39.7425 : 30.2385;
	multiplier		= (!multiplier)		? 1 : multiplier;
	rub_addition	= (!rub_addition)	? 0 : rub_addition;
	
	rub_price = Math.ceil(curr_price * rub_rate * multiplier) + rub_addition;
	
	document.write(rub_price);
}