import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		long N;
		long A;
		long B;
		long X;
		long mod;
		Scanner sc = new Scanner(System.in);
		N = sc.nextLong();
		A = sc.nextLong();
		B = sc.nextLong();
		X = N / (A + B);
		mod = N % (A + B);
		System.out.println(X * A + Math.min(mod, A));
		sc.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