Contest: Task: Related: TaskB

Score : $100$ points

We will buy a product for $N$ yen (the currency of Japan) at a shop.

If we use only $1000$-yen bills to pay the price, how much change will we receive?

Assume we use the minimum number of bills required.

- $1 \leq N \leq 10000$
- $N$ is an integer.

Input is given from Standard Input in the following format:

$N$

Print the amount of change as an integer.

1900

100

We will use two $1000$-yen bills to pay the price and receive $100$ yen in change.

3000

0

We can pay the exact price.