
import java.util.*;
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();

        double nn = Math.floor(n / (a+b) * 1.0);

        long blue = ((long)nn) * a;
        long red = ((long)nn) * b;

        if (blue + red + a <= n) blue += a;
        else blue += (n - (blue + red));

        System.out.println(blue);

    }
}
/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