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();

		if (A == 0) {
			System.out.println(0);
		} else {
			long count = N / (A+B);
			if (N % (A+B) < A) {
				System.out.println(A*count + N % (A+B));
			} else {
				System.out.println(A*count + 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