import java.util.Scanner;


public class Main_yukicoder49 {

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

        String s = sc.next();
        int ret = 0;
        boolean p = true;
        for (int i = 0; i < s.length(); ) {
        	int plus = s.indexOf('*', i);
        	if (plus == -1) {
        		plus = s.length();
        	}
        	int mul = s.indexOf('+', i);
        	if (mul == -1) {
        		mul = s.length();
        	}
        	int next;
        	if (plus < mul) {
        		next = plus;
        	} else {
        		next = mul;
        	}
        	
        	int tmp = Integer.parseInt(s.substring(i, next));
        	
        	if (p) {
        		ret += tmp;
        	} else {
        		ret *= tmp;
        	}
        	
        	if (next == plus) {
        		p = true;
        	} else {
        		p = false;
        	}
        	
        	i = next + 1;
        }
        
        System.out.println(ret);

        sc.close();
    }
}