import java.util.Scanner;

public class Main2 {
    public static void main(String[] args) {
        try (Scanner scan = new Scanner(System.in)) {
            String S = scan.next();
            String strList[] = S.split("\\*|\\+");
            int list[] = new int[strList.length];
            for(int i=0; i<list.length; i++) {
                list[i] = Integer.parseInt(strList[i]);
            }
            
            int count = 1;
            for(int i=0; i<S.length(); i++) {
                char ch = S.charAt(i);
                if(ch == '*') {
                    list[0] = list[0] + list[count];
                    count++;
                } else if(ch == '+') {
                    list[0] = list[0] * list[count];
                    count++;
                }
            }
            System.out.println(list[0]);
        }
    }
}