import java.util.Scanner;
public class game {

    public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int result = 0;
    int N = Integer.parseInt(sc.nextLine());
    int f=N/100;
    int s=(N/10)%10;
    int t=(N%10);

    if(s==1||s==0){ result=f+s+t;} //second = 1 or 0
    else if (t==0&&f==1){result=f+s+t;} //third = 0 first =1
    else if (t==0&&f!=1){result=f*s+t;} //third = 0
    else if (t==1&&f==1){result=f+s+t;} //third = 1 first =1
    else if (t==1&&f!=1){result=f*s+t;} //third = 1
    else if (f==1||f==0){result=f+s*t;}

    else{result=f*s*t;}
    System.out.println(result);
    }
}