import java.util.Scanner;

import static java.lang.Integer.max;
import static java.lang.Integer.min;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt(), x = in.nextInt(), y = in.nextInt();

        int mx = max(x , y);
        int mn = min(x, y);

        int timer = mn;
        int ready = 0;
        while (ready < N) {
            if (timer % mn == 0) ready += 1;
            if ((timer - mn) % mx == 0) ready += 1;
            timer += 1;
        }

        System.out.println(timer);
    }
}