p02612 AtCoder Beginner Contest 173 - Payment
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.

Constraints

* 1 \leq N \leq 10000
* N is an integer.

Input

Input is given from Standard Input in the following format:


N


Output

Print the amount of change as an integer.

Examples

Input

1900


Output

100


Input

3000


Output

0
```python
int = int(input())
print((1000 - int % 1000) % 1000)
```