import java.util.*;

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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        long N=sc.nextLong(),A=sc.nextLong(),B=sc.nextLong();
        sc.close();
        long ans=(N/(A+B))*A;
        if(N%(A+B)<A) ans+=N%(A+B);
        else ans+=A;
        System.out.println(ans);
    }
}
