import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author silviase
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BCountBalls solver = new BCountBalls();
        solver.solve(1, in, out);
        out.close();
    }

    static class BCountBalls {
        public void solve(int testNumber, Scanner in, PrintWriter out) {

            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            // a + b 個ごとにa
            out.println(n / (a + b) * a + Math.min(a, n % (a + b)));

        }

    }
}
 import java.io.OutputStream; OutputStream java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.PrintWriter; PrintWriter java.io import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BCountBalls solver = new BCountBalls();
        solver.solve(1, in, out);
        out.close();
    }

    static class BCountBalls {
        public void solve(int testNumber, Scanner in, PrintWriter out) {

            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            // a + b 個ごとにa
            out.println(n / (a + b) * a + Math.min(a, n % (a + b)));

        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BCountBalls solver = new BCountBalls();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BCountBalls solver = new BCountBalls();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) BCountBalls solver = new BCountBalls(); solver new BCountBalls() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class BCountBalls {
        public void solve(int testNumber, Scanner in, PrintWriter out) {

            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            // a + b 個ごとにa
            out.println(n / (a + b) * a + Math.min(a, n % (a + b)));

        }

    } BCountBalls public void solve(int testNumber, Scanner in, PrintWriter out) {

            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            // a + b 個ごとにa
            out.println(n / (a + b) * a + Math.min(a, n % (a + b)));

        } solve {

            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            // a + b 個ごとにa
            out.println(n / (a + b) * a + Math.min(a, n % (a + b)));

        } long n = in.nextLong(); n in.nextLong() in.nextLong in long a = in.nextLong(); a in.nextLong() in.nextLong in long b = in.nextLong(); b in.nextLong() in.nextLong in out.println(n / (a + b) * a + Math.min(a, n % (a + b))) out.println out n / (a + b) * a + Math.min(a, n % (a + b)) n / (a + b) * a n / (a + b) n (a + b) a b a Math.min(a, n % (a + b)) Math.min Math a n % (a + b) n (a + b) a b int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BCountBalls solver = new BCountBalls();
        solver.solve(1, in, out);
        out.close();
    }

    static class BCountBalls {
        public void solve(int testNumber, Scanner in, PrintWriter out) {

            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            // a + b 個ごとにa
            out.println(n / (a + b) * a + Math.min(a, n % (a + b)));

        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BCountBalls solver = new BCountBalls();
        solver.solve(1, in, out);
        out.close();
    }

    static class BCountBalls {
        public void solve(int testNumber, Scanner in, PrintWriter out) {

            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            // a + b 個ごとにa
            out.println(n / (a + b) * a + Math.min(a, n % (a + b)));

        }

    }
} Main
import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author silviase
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        BCountBalls solver = new BCountBalls();
        solver.solve(1, in, out);
        out.close();
    }

    static class BCountBalls {
        public void solve(int testNumber, Scanner in, PrintWriter out) {

            long n = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();
            // a + b 個ごとにa
            out.println(n / (a + b) * a + Math.min(a, n % (a + b)));

        }

    }
}

