import java.util.Scanner;

public class Game {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);


        int number = scanner.nextInt();

        int left = number / 100;
        int mid = (number / 10) % 10;
        int right = number % 10;

        int first = left + mid + right;
        int second = left + mid * right;
        int third = left * mid * right;
        int fourth = left * mid + right;

        int max = first;

        if (second > max) {
            max = second;
        } else if (third > max) {
            max = third;
        } else if (fourth > max) {
            max = fourth;
        }

        System.out.println(max);


    }
}