题目描述
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.
-----Sample Input-----
1900
-----Sample Output-----
100
We will use two 1000-yen bills to pay the price and receive 100 yen in change.
输入格式
见题面
输出格式
见题面
样例输入
1900
样例输出
100