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 divide = (long) N/(A+B);
        long ans = 0;
        ans += divide * A;

        if(N%(A+B) >= A){
            ans += A;
        }else{
            ans += N%(A+B);
        }

        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 divide = (long) N/(A+B);
        long ans = 0;
        ans += divide * A;

        if(N%(A+B) >= A){
            ans += A;
        }else{
            ans += N%(A+B);
        }

        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 divide = (long) N/(A+B);
        long ans = 0;
        ans += divide * A;

        if(N%(A+B) >= A){
            ans += A;
        }else{
            ans += N%(A+B);
        }

        System.out.println(ans);

    } main {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long A = sc.nextLong();
        long B = sc.nextLong();

        long divide = (long) N/(A+B);
        long ans = 0;
        ans += divide * A;

        if(N%(A+B) >= A){
            ans += A;
        }else{
            ans += N%(A+B);
        }

        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 divide = (long) N/(A+B); divide (long) N/(A+B) (long) N (A+B) A B long ans = 0; ans 0 ans += divide * A ans divide * A divide A if(N%(A+B) >= A){
            ans += A;
        }else{
            ans += N%(A+B);
        } N%(A+B) >= A N%(A+B) N (A+B) A B A {
            ans += A;
        } ans += A ans A {
            ans += N%(A+B);
        } ans += N%(A+B) ans N%(A+B) N (A+B) A B 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 divide = (long) N/(A+B);
        long ans = 0;
        ans += divide * A;

        if(N%(A+B) >= A){
            ans += A;
        }else{
            ans += N%(A+B);
        }

        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 divide = (long) N/(A+B);
        long ans = 0;
        ans += divide * A;

        if(N%(A+B) >= A){
            ans += A;
        }else{
            ans += N%(A+B);
        }

        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 divide = (long) N/(A+B);
        long ans = 0;
        ans += divide * A;

        if(N%(A+B) >= A){
            ans += A;
        }else{
            ans += N%(A+B);
        }

        System.out.println(ans);

    }

}
