using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;

class Magatro
{

    static void Main()
    {
        string S = Console.ReadLine();
        int ans = 0;
        Ty T = Ty.puls;
        string SS = "";
        for(int i = 0; i < S.Length; i++)
        {
            if (S[i] == '*')
            {
                if (T == Ty.puls)
                {
                    ans += int.Parse(SS);

                }
                else
                {
                    ans *= int.Parse(SS);
                }
                T = Ty.puls;
                SS = "";
            }
            else if (S[i] == '+')
            {
                if (T == Ty.puls)
                {
                    ans += int.Parse(SS);

                }
                else
                {
                    ans *= int.Parse(SS);
                }
                SS = "";
                T = Ty.kakeru;
            }
            else
            {
                SS += S[i];
            }
        }
        if (T == Ty.puls)
        {
            ans += int.Parse(SS);

        }
        else
        {
            ans *= int.Parse(SS);
        }
        Console.WriteLine(ans);
    }
}
public enum Ty
{
    puls, kakeru
}