Century of a year

You are given a year $y$. Find which century it belongs to. The 1st century is years $1$ to $100$, the 2nd century is years $101$ to $200$, and so on. For example, $2000$ is in the 20th century, and $2001$ is already in the 21st.

A single integer $y$ ($1 \le y \le 10^9$).

A single integer — the century number.

Plain $y / 100$ is wrong here: $2001 / 100 = 20$, but $2001$ is in the 21st century. You need division rounded up: $(y + 99) / 100$, or $y / 100$ plus $1$ when the remainder is not zero.