A: Soylent

https://open.kattis.com/problems/soylent

We would like to find the minimum number of bottles that Yraglac needs to consume in order to hit his daily calorie requirement.

So, if the daily requirement is $N$ calories, we are interested in the smallest integer $b$ such that $400 \cdot b \geq N$ . Thus, the required value of $b$ is $\lceil{\frac{N}{400}}\rceil$, where $\lceil x \rceil$denotes the smallest integer greater than or equal to x.

int b = (N+399)/400;