using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Code
{
    class Program
    {
        static void Main(string[] args)
        {
            string line = Console.ReadLine();
            line += "e";
            int sum = 0;
            int num = 0;
            char ope = '*';
            foreach(var c in line)
            {
                if (c == '*' || c == '+' || c == 'e') {
                    if (ope == '*') sum += num;
                    else sum *= num;
                    num = 0;
                    ope = c; 
                }
                else num = num * 10 + int.Parse("" + c);
            }

            Console.WriteLine(sum);
        }
    }
}