import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.LinkedList;
import java.util.Queue;

public class No49 {

    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            String S = br.readLine();

            System.out.println(calc(S));
        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }

    private static int calc(String S) {
        Queue<String> operatorQueue = new LinkedList<String>();
        Queue<Integer> numQuque = new LinkedList<Integer>();

        String[] numArray = S.split("[\\+*]");

        // 数字をキューに格納
        for (int i = 0; i < numArray.length; i++) {
            numQuque.add(Integer.parseInt(numArray[i]));
        }

        int sLnegth = S.length();
        // 演算子をキューに格納
        for (int i = 0; i < sLnegth; i++) {
            if (!S.substring(i, i + 1).matches("[0-9]"))
                operatorQueue.add(S.substring(i, i + 1));
        }

        // 計算
        int ans = numQuque.poll();
        int num = 0;
        String ope = "";
        while (!numQuque.isEmpty()) {
            num = numQuque.poll();
            ope = operatorQueue.poll();
            if (ope.equals("+")) {
                ans = ans * num;
            } else {
                ans = ans + num;
            }
        }
        return ans;

    }

}