import java.math.*;
import java.util.*;
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==0){
            System.out.println(0);
        } else if(b==0){
            System.out.println(n);
        } else {
            long s = n/(a+b);
            if(n-s*(a+b)<=a){
                System.out.println(s*a+n-s*(a+b));
            } else {
                System.out.println(s*a+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