Калькулятор услуг JS

function calc() { 
var post = document.getElementById("post"); 
var kind1 = document.getElementById("kind1"); 
var kind2 = document.getElementById("kind2"); 
var time1 = document.getElementById("time1"); 
var time2 = document.getElementById("time2"); 
var result = document.getElementById("result"); 
 
var price = 0; 
price += parseInt(post.options[post.selectedIndex].value); 
price += (kind1.checked == true) ? parseInt(kind1.value) : 0; 
price += (kind2.checked == true) ? parseInt(kind2.value) : 0; 
price += (time1.checked == true) ? parseInt(time1.value) : 0; 
price += (time2.checked == true) ? parseInt(time2.value) : 0; 
 
document.getElementById('result').innerHTML = price    
}

			<div class="block-calc"> 
					<p>Тип охраны</p> 
						<input class="radio" type="radio" onchange="calc()" value="100" id="kind1" name="radio" required /> 
							<label for="kind1">Вооруженная</label> 
						<input class="radio" type="radio" onchange="calc()" value="65" id="kind2" name="radio" required /> 
							<label for="kind2">Невооруженная</label> 
					<p>Количество постов</p> 
       				<select onchange="calc()" id="post"> 
						<option value="0">Выбрать</option> 
						<option value="780">1 пост</option> 
						<option value="1560">2 поста</option> 
						<option value="2340">3 поста</option> 
						<option value="3120">4 поста</option> 
						<option value="3900">5 постов</option> 
					</select> 
					<p>Количество часов в сутки</p> 
						<input class="radio2" type="radio" onchange="calc()" value="30" id="time1" name="radio2" required /> 
							<label for="time1">12 часов</label> 
						<input class="radio2" type="radio" onchange="calc()" value="60" id="time2" name="radio2" required /> 
							<label for="time2">24 часа</label> 
				<div class="cost">Стоимость: <span id="result">0</span> рублей в месяц</div> 
				<div class="za"><a href="#">Заказать</a></div> 
			</div>