import java.util.Scanner;
public class MultiplicacionRusa {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc = new Scanner(System.in);
int n,m;
n=sc.nextInt();
m=sc.nextInt();
sc.close();
int sol = mult(n,m);
System.out.println(sol);
}
public static int mult (int n, int m){
if(m==1){
return n*2;
}else{
if(m%2==0){
return mult(n*2,m/2);
}else{
return n+mult(n*2,m/2);
}
}
}
}
|