Problem Statement

Takahashi has many red balls and blue balls. Now, he will place them in a row.
Initially, there is no ball placed.
Takahashi, who is very patient, will do the following operation 10^{100} times:

• Place A blue balls at the end of the row of balls already placed. Then, place B red balls at the end of the row.

How many blue balls will be there among the first N balls in the row of balls made this way?

Input

Input is given from Standard Input in the following format:
N A B

Output

Print the number of blue balls that will be there among the first N balls in the row of balls.

Constraints

• $1 \leq N \leq 10^{18}$
• $A, B \geq 0$
• $0 < A + B \leq 10^{18}$
• All values in input are integers.

Sample Input 1

8 3 4

Sample Output 1

4

Let b denote a blue ball, and r denote a red ball. The first eight balls in the row will be bbbrrrrb, among which there are four blue balls.

Sample Input 2

8 0 4

Sample Output 2

0

He placed only red balls from the beginning.

Sample Input 3

6 2 4

Sample Output 3

2

Among bbrrrr, there are two blue balls.

见题面 Input 部分

见题面 Output 部分