The following table shows the caloric values of three types of food in kilocalories per gram of food:

Food type Carbohydrates Fat Protein
Caloric value 4 kcal1 g 9 kcal1 g 4 kcal1 g

Alexandra decides to climb Mt. Krumpett, which is 5000 m high. She determines that this will require a total of 3600 kcal of energy for the trip. For her food supply, she decides to take nutrition bars. The label states that each bar contains 50 g of carbohydrates, 10 g of fat, and 40 g of protein.

How many nutrition bars should Alexandra pack?
Express the number of bars numerically.