Problem:
Score : 200 points

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?

Constraints

1 \leq N \leq 10^{18}

A, B \geq 0

0 < A + B \leq 10^{18}

All values in input are integers.

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.

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.

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;

using System.Text;
using System.Threading.Tasks;

using System.Globalization;

namespace AtCoder
{
    class Program
    {
        public static void Main()
        {
            string[] str = Console.ReadLine().Split(' ');
            decimal N = decimal.Parse(str[0]);
            decimal A = decimal.Parse(str[1]);
            decimal B = decimal.Parse(str[2]);
            decimal Sum = 0;
            decimal Q = 0;

            Q = Math.Floor(N / (A + B));

            Sum += A * Q;
            N -= (A + B) * Q;

            if(N >= A)
            {
                Sum += A;
            }
            else
            {
                Sum += N;
            }

            Console.WriteLine("{0}", Sum);
            
        }   
    }
}