import java.util.*;
public class Main{
    static boolean[] div = new boolean[100000001];
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int m = scan.nextInt(); 
        int min = Math.min(n,m);
        int max = Math.max(n,m);
        int res = 0;
        div[0] = true;
        for(int i=min;i<=100000000;i++){
            if(div[i-min]==true||(i>=max&&div[i-max]==true)){
                div[i] = true;
            }else{
                div[i] = false;
                res=i;
            }
        }
        System.out.print(res);
    }
}