import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		long N = scan.nextLong();
		long b = scan.nextLong();
		long r = scan.nextLong();
		long res = N / (b+ r);
		long mod = N % (b+ r);

		if(mod > b){
			mod = b;
		}
		System.out.println(res*b + mod);

	}
}
/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