using System;
using System.Collections.Generic;
using System.Linq;

namespace yukicoder
{
	public class Program
	{
        public static int sum = 0;
		public static void Main()
		{
			var s = Console.ReadLine();
			var i = 0;
			var a = "";
			var k = true;
            while (i < s.Length)
            {
                if (s[i] == '+')
                {
                    Cal(a, k);
                    k = false;
                    a = "";
                }
				else if (s[i] == '*')
                {
                    Cal(a, k);
                    k = true;
                    a = "";
                }
                else
                {
                    a += s[i];
                }
                i++;
            }
            Cal(a, k);
            Console.WriteLine(sum);
        }
        public static void Cal(string a,bool k)
        {
            if (k)
            {
                sum += int.Parse(a);
            }
            else
            {
                sum *= int.Parse(a);
            }
        }
    }
}