import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	long N = sc.nextLong();
      	long A = sc.nextLong();
      	long B = sc.nextLong();
      
      	long ans = N / (A+B) * A;
      	long rem = N % (A+B);
      	ans += Math.min(rem, A);
      
      	System.out.println(ans);
    }
} import java.util.*; util.* java public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	long N = sc.nextLong();
      	long A = sc.nextLong();
      	long B = sc.nextLong();
      
      	long ans = N / (A+B) * A;
      	long rem = N % (A+B);
      	ans += Math.min(rem, A);
      
      	System.out.println(ans);
    }
} Main public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	long N = sc.nextLong();
      	long A = sc.nextLong();
      	long B = sc.nextLong();
      
      	long ans = N / (A+B) * A;
      	long rem = N % (A+B);
      	ans += Math.min(rem, A);
      
      	System.out.println(ans);
    } main {
    	Scanner sc = new Scanner(System.in);
      	long N = sc.nextLong();
      	long A = sc.nextLong();
      	long B = sc.nextLong();
      
      	long ans = N / (A+B) * A;
      	long rem = N % (A+B);
      	ans += Math.min(rem, A);
      
      	System.out.println(ans);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long N = sc.nextLong(); N sc.nextLong() sc.nextLong sc long A = sc.nextLong(); A sc.nextLong() sc.nextLong sc long B = sc.nextLong(); B sc.nextLong() sc.nextLong sc long ans = N / (A+B) * A; ans N / (A+B) * A N / (A+B) N (A+B) A B A long rem = N % (A+B); rem N % (A+B) N (A+B) A B ans += Math.min(rem, A) ans Math.min(rem, A) Math.min Math rem A System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	long N = sc.nextLong();
      	long A = sc.nextLong();
      	long B = sc.nextLong();
      
      	long ans = N / (A+B) * A;
      	long rem = N % (A+B);
      	ans += Math.min(rem, A);
      
      	System.out.println(ans);
    }
} public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	long N = sc.nextLong();
      	long A = sc.nextLong();
      	long B = sc.nextLong();
      
      	long ans = N / (A+B) * A;
      	long rem = N % (A+B);
      	ans += Math.min(rem, A);
      
      	System.out.println(ans);
    }
} Main
import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      	long N = sc.nextLong();
      	long A = sc.nextLong();
      	long B = sc.nextLong();
      
      	long ans = N / (A+B) * A;
      	long rem = N % (A+B);
      	ans += Math.min(rem, A);
      
      	System.out.println(ans);
    }
}