import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long n = scan.nextLong();
		long a = scan.nextLong();
		long b = scan.nextLong();

		long sum = n / (a + b) * a;
		long remain = n % (a+b);

		if(remain < a) {
			sum += remain;
		}else {
			sum += a;
		}
		System.out.println(sum);
		scan.close();
	}

}

/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