import java.util.*;
class B{
public static void main (String args []){
Scanner reader=new Scanner(System.in);
double i = 1;
while(reader.hasNextInt()){
i*=reader.nextInt();
}
System.out.println(i);
}
}
class B{
public static void main (String args []){
Scanner reader=new Scanner(System.in);
double i = 1;
while(reader.hasNextInt()){
i*=reader.nextInt();
}
System.out.println(i);
}
}