import java.util.Scanner;

public class Main{

    public static void main(String[] args){

        Scanner sc = new Scanner(System.in);
        long n = sc.nextLong();
        long a = sc.nextLong();
        long b = sc.nextLong();

        if(a+b==0){
            System.out.println(0);
            return;
        }

        long rem = n % (a+b);
        n -= rem;
        System.out.println(n/(a+b)*a + Math.min(rem,a));
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz