CF808A.Lucky Year

Apart 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.

除了全年拥有大量假期外，伯兰德的居民还有所谓的“幸运年份”。如果一个年份的数字中至多包含 1 个非零数字，则该年份被视为幸运年份。因此，年份 100、40000、5 是幸运年份，而 12、3001 和 12345 则不是。

你将获得伯兰德当前的年份。你的任务是计算伯兰德居民需要等待多久才能迎来下一个幸运年份。

The first line contains integer number n (1 ≤ n ≤ 109) — current year in Berland.

第一行包含一个整数 $ n $（$ 1 \leq n \leq 10^9 $）—— Berland 当前的年份。

Output amount of years from the current year to the next lucky one.

输出从当前年份到下一个幸运年份之间的年份数量。

In the first example next lucky year is 5. In the second one — 300. In the third — 5000.

第一个样例中，下一个幸运年份是 5。第二个样例中是 300。第三个样例中是 5000。