How to round up a number having any decimal part superior to 0

Question

I have the following instructions for one of my labs.

program that will prompt the user for the weight and price of the produce, the price and capacity of a plastic bag and then calculates and displays the total cost of the sale. You may assume that all customers will require bags.

this is what I have so far:

string userInput;
double weight;
double price;
double capacityOfBag;
double bagPrice;
double bags;
uint numberOfBags;
uint remainder;
double cost;

Console.WriteLine("Please input the following in order to calculate the cost of sale");

Console.Write("Weight? ");
userInput = Console.ReadLine();
weight = Convert.ToDouble(userInput);

Console.Write("Price? ");
userInput = Console.ReadLine();
price = Convert.ToDouble(userInput);

Console.Write("Capacity of bag? ");
userInput = Console.ReadLine();
capacityOfBag = Convert.ToDouble(userInput);

Console.Write("Price of bag? ");
userInput = Console.ReadLine();
bagPrice = Convert.ToDouble(userInput);

bags = weight / capacityOfBag;
numberOfBags = ?????
cost = weight * price + numberOfBags * bagPrice;

Console.WriteLine($"The customer needs {numberOfBags} bags");
Console.WriteLine($"Total cost of the sale is {cost:c}");

The calculation should be simple, however, if the weight and the capacityOfBag are double numbers, say 24.3 and 5, then bags would be 4.86. however, I should have 5 bags!

What would numberOfBags be?

We haven't learned about if statements, so please don't use it in your answer, only simple math can be applied here :D

PS. Math library can't be used either.

Thanks.