Problem2092--ABC173A - Payment

2092: ABC173A - Payment

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Time Limit : 1.000 sec  Memory Limit : 128 MB

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Description

Time Limit: 2 sec / Memory Limit: 1024 MB

Problem Statement
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≤N≤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 Copy 

1900

Sample Output Copy 

100

Source/Category

AtCoder 强 基础  青铜  数学 取余 运算 算术 
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