import java.util.Scanner;

public class Main {
	static boolean memo[];
	static int ans, min;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		StringBuilder sb = new StringBuilder();
		char[] s = sc.next().toCharArray();
		String a = "", b = "";
		int sum = 0;
		int idx = 0;
		for (int i = 0; i < s.length; i++) {
			if (s[i] == '+') {
				i++;
				if (!a.equals("")) {
					sum += Integer.parseInt(a);
				}
				a = "";
				for (; i < s.length; i++) {
					if (s[i] != '*' && s[i] != '+') {
						a += s[i];
					} else {
						i--;
						break;
					}
				}
				sum *= Integer.parseInt(a);
				a = "";
			} else if (s[i] == '*') {
				i++;
				if (!a.equals("")) {
					sum += Integer.parseInt(a);
				}
				a = "";
				for (; i < s.length; i++) {
					if (s[i] != '*' && s[i] != '+') {
						a += s[i];
					} else {
						i--;
						break;
					}
				}
				sum += Integer.parseInt(a);
				a = "";
			} else {
				a += s[i];
			}
		}
		System.out.println(sum);
	}
}