Frog Going Straight

A frog is about to return to the burrow. The burrow is D centimeters ahead of the frog, and the frog goes straight toward the burrow. There are only two actions that a frog can do:

• Large jump (go forward L centimeters)
• Small jump (go 1 cm forward)

The frog aims to just land in the burrow without jumping over it.

Create a program that asks how many times a frog needs to jump to return to its burrow.

Input

The input is given in the following format.

DL

The input is one line, given the distance D (1 ≤ D ≤ 10000) to the burrow and the distance L (2 ≤ L ≤ 10000) for the frog to travel on a large jump.

Output

Print on one line how many times the frog needs to jump.

Examples

Input

10 5

Output

2

Input

7 4

Output

4

inputFormat

Input

The input is given in the following format.

DL

The input is one line, given the distance D (1 ≤ D ≤ 10000) to the burrow and the distance L (2 ≤ L ≤ 10000) for the frog to travel on a large jump.

outputFormat

Output

Print on one line how many times the frog needs to jump.

Examples

Input

10 5

Output

2

Input

7 4

Output

4

样例

10 5

2