import java.util.Scanner;

public class Main {
  	public static void main(String[] args){
      //入力値の取得
      Scanner sc = new Scanner(System.in);
      long n = sc.nextLong();
      long a = sc.nextLong();
      long b = sc.nextLong();
      sc.close();

      if (a==0 && b==0) {
    	  System.out.println(0);
    	  return;
      }

      long answer = n/(a+b)*a;
      if (n%(a+b) <a) {
    	  answer+=n%(a+b);
      } else {
    	  answer+=a;
      }
      System.out.println(answer);
  	}
}
/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