import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int ans = 0;
        char prev = '*';
        int tmp = 0;
        for (char c : sc.next().toCharArray()) {
            if (c == '*' || c == '+') {
                if (prev == '*') {
                    ans += tmp;
                } else {
                    ans *= tmp;
                }
                tmp = 0;
                prev = c;
            } else {
                tmp *= 10;
                tmp += c - '0';
            }
        }
        if (prev == '*') {
            ans += tmp;
        } else {
            ans *= tmp;
        }
        System.out.println(ans);
    }
}