import java.util.Scanner;
public class Game2 {
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();

        int[] intTab = String.valueOf(N).chars().map(Character::getNumericValue).toArray();
        int i = 0;
        int sumOfFirstTwo = intTab[0] + intTab[1] * intTab [2];
        int sumOfSecondTwo = intTab[0] * intTab[1] + intTab [2];
        int sumOfThidTwo = intTab[0] + intTab[1] + intTab [2];
        int sumOfFourthTwo = intTab[0] * intTab[1] * intTab [2];
        if(Math.max(sumOfFirstTwo,sumOfSecondTwo) > Math.max(sumOfThidTwo,sumOfFourthTwo)){
            System.out.print(Math.max(sumOfFirstTwo,sumOfSecondTwo));
        }
        else {
            System.out.print(Math.max(sumOfThidTwo,sumOfFourthTwo));
        }


    }
}