Score : $100$ points

Problem Statement

There is an enemy with stamina $A$. Every time you attack the enemy, its stamina reduces by $B$.

At least how many times do you need to attack the enemy to make its stamina $0$ or less?

Constraints

• $1 \le A,B \le 10^{18}$
• $A$ and $B$ are integers.

Input

The input is given from Standard Input in the following format:

$A$ $B$

Output

Print the answer.

7 3

3

Attacking three times make the enemy's stamina $-2$.

Attacking only twice makes the stamina $1$, so you need to attack it three times.

123456789123456789 987654321

124999999

999999999999999998 2

499999999999999999