题目描述
Takahashi loves takoyaki - a ball-shaped snack.
With a takoyaki machine, he can make at most X pieces of takoyaki at a time, taking T minutes regardless of the number of pieces to make.
How long does it take to make N takoyaki?
-----Constraints-----
- $1 \leq N,X,T \leq 1000$
- All values in input are integers.
-----Input-----
Input is given from Standard Input in the following format:
N X T
-----Output-----
Print an integer representing the minimum number of minutes needed to make N pieces of takoyaki.
-----Sample Input-----
20 12 6
-----Sample Output-----
12
He can make 12 pieces of takoyaki in the first 6 minutes and 8 more in the next 6 minutes, so he can make 20 in a total of 12 minutes.
Note that being able to make 12 in 6 minutes does not mean he can make 2 in 1 minute.
输入格式
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输出格式
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