编程题：Dripping Water Wears Through a Stone

Dripping water wears away stone is an idiom, which originated from the 《Chinese book • Meicheng biography》by Ban Gu of the Eastern Han Dynasty.

The idiom means that water drops continuously, can drop through the stone; persistence in metaphor, subtle power can also achieve the difficult work.



It is assumed that M drops of water can penetrate a 1 micron thick stone. How many drops of water does it take for a given N micron thick stone to break through?

## Input:

In one line there are two positive integers N,M.(1≤N≤1000000, 1≤M≤1000).

## Output:

The test case output a line. Output the number of water drops that break through for a given N micron thick stone.

## Sample Input:


in
100000 2


## Sample Output:



out
200000







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