Print a number between $A$ and $B$ (inclusive) that is a multiple of $C$.
If there is no such number, print `-1`.
输入格式
Input is given from Standard Input in the following format:
>$A$ $B$ $C$
#### Constraints
- $1 \leq A \leq B \leq 1000$
- $1 \leq C \leq 1000$
- All values in input are integers.
输出格式
Print the answer.
If there is no number with the desired property, print `-1`.
样例输入 #1
123 456 100
样例输出 #1
200
样例输入 #2
630 940 314
样例输出 #2
-1
提示
***For Sample #1:***
`300` or `400` would also be accepted.