import java.util.Scanner;

public class Yukicoder49 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		String[] a = s.split("[*+]");
		String sign = s.replaceAll("[0-9]", "");
		int res;

		res = Integer.parseInt(a[0]);
		for (int i = 1; i < a.length; i++) {
			if (sign.charAt(i - 1) == '*') res += Integer.parseInt(a[i]);
			else if (sign.charAt(i - 1) == '+') res *= Integer.parseInt(a[i]);
		}
		System.out.println(res);
	}
}