import java.util.*;

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