Contest: Task: Related: TaskA TaskC

Score : $200$ points

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?

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

Input is given from Standard Input in the following format:

$N$ $A$ $B$

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

8 3 4

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.

8 0 4

0

He placed only red balls from the beginning.

6 2 4

2

Among `bbrrrr`

, there are two blue balls.