using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp
{
    class Math
    {
        static public List<string> MathParse(string input)
        {
            var primer = new List<string>();
            var num = "";
            foreach (char k in input)
            {
                if (char.IsDigit(k))
                    num += k;
                else
                {
                    primer.Add(num);
                    num = "";
                    primer.Add(k + " ");
                }
            }
            primer.Add(num);
            return primer;
        }
        public static string MathSolve(List<string> primer)
        {
            var i = 1;
            while (i < primer.Count)
            {
                if (primer[i] == "* " || primer[i] == "/ " || primer[i] == "% ")
                {
                    var z = primer[i];
                    string ans;
                    if (z == "* ")
                    {
                        ans = (int.Parse(primer[i - 1]) * int.Parse(primer[i + 1])).ToString();
                    }
                    else if (z == "/ ")
                    {
                        ans = (int.Parse(primer[i - 1]) / int.Parse(primer[i + 1])).ToString();
                    }
                    else
                    {
                        ans = (int.Parse(primer[i - 1]) % int.Parse(primer[i + 1])).ToString();
                    }
                    primer[i - 1] = ans;
                    primer.RemoveAt(i + 1);
                    primer.RemoveAt(i);

                }
                else i += 1;
            }
            if (primer.Count == 1)
                return primer[0];
            i = 1;
            while (i < primer.Count)
            {
                if (primer[i] == "+ " || primer[i] == "- ")
                {
                    var z = primer[i];
                    string ans;
                    if (z == "+ ")
                    {
                        ans = (int.Parse(primer[i - 1]) + int.Parse(primer[i + 1])).ToString();
                    }
                    else
                    {
                        ans = (int.Parse(primer[i - 1]) - int.Parse(primer[i + 1])).ToString();
                    }
                    primer[i - 1] = ans;
                    primer.RemoveAt(i + 1);
                    primer.RemoveAt(i);
                }
                else i += 1;
            }
            return primer[0];
        }
        public static string MathSolve(string objects)
        {
            var primer = MathParse(objects);
            var answer = MathSolve(primer);
            return answer;
        }
    }
}