Lucky Year
题目描述
A. Lucky Year
time limit per test
1 secondmemory limit per test
256 megabytesinput
standard inputoutput
standard outputApart from having lots of holidays throughout the year, residents of Berland also have whole lucky years. Year is considered lucky if it has no more than 1 non-zero digit in its number. So years 100, 40000, 5 are lucky and 12, 3001 and 12345 are not.
You are given current year in Berland. Your task is to find how long will residents of Berland wait till the next lucky year.
Input
The first line contains integer number n (1≤n≤109) − current year in Berland.
Output
Output amount of years from the current year to the next lucky one.
Examples
Input
4
Output
1
Input
201
Output
99
Input
4000
Output
1000
Note
In the first example next lucky year is 5. In the second one − 300. In the third − 5000.
题目来源：fps-www.educg.net-codeforce-1-2833.xml.zip；FPS 共享题包，题包内第 188 题。保留原作者与原赛事署名。