import java.util.Scanner;
import java.lang.Math;
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();
    System.out.println((n/(a+b))*a + Math.min(a,n%(a+b)));}
}
/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