C. World capital of pizza
time limit per test
0.25 seconds
memory limit per test
1024 megabytes
input
standard input
output
standard output

São Paulo is widely celebrated as the Pizza Capital of the World. The city produces nearly 4 pizzas per second, surpassing the mark of 300,000 pizzas per day. It is the second-largest consumer of pizza in the world, behind only New York City.

In this problem, you must help calculate an essential piece of information when ordering pizza delivery. If there are $$$N$$$ pizzas, each cut into 8 slices, and $$$M$$$ people sharing them, what is the maximum number of slices each person can eat if everyone must eat the same number of slices?

For example, if there are 2 pizzas and 3 people, then there are 16 slices in total, and each person can eat at most 5 slices (leaving 1 slice uneaten).

Input

The first and only line of the input contains two integers $$$N$$$ and $$$M$$$ ($$$1 \leq N \leq 100$$$, $$$1 \leq M \leq 20$$$), representing respectively the number of 8-slice pizzas and the number of people sharing them.

Output

The output should consist of a single line containing an integer representing the maximum number of slices that each person can eat.

Examples
Input
2 3
Output
5
Input
10 8
Output
10