#include <iostream>
#include<vector>
#include<stack>
#include<stdio.h>
#include <string>
#include<fstream>

using namespace std;

vector<int> nr;
stack<int> operanzi;
stack<char>operatori;
bool esteparanteza(const char& c)
{
    if(c=='('||c==')')
        return true;
    return false;
}
bool estenumar(const char&c)
{
    if(c>='0'&&c<='9')
        return true;
    return false;
}
bool prioritate(const char&nou,const char&vechi)
{
    if((nou=='+'||nou=='-')&&(vechi=='*'||vechi=='/'))
       return true;
    return false;

}
string procesare(string expresie)
{
    int i=0;
    char c;
    string ret;
    operatori.push('x');
    while(i<expresie.size())
    {
        c=expresie[i];
        if(esteparanteza(c))
        {
            if(c=='(')
               {
                   operatori.push(c);
                   i++;

               }
               else{
                        c=operatori.top();
                        while(c!='(')
                   {
                       ret+=c;
                       operatori.pop();
                       c=operatori.top();
                   }
                   operatori.pop();
                   i++;

                    }
        }
        else
        {
            if(estenumar(c))
            {
                ret+='0';
                int n=0;
                while(i<expresie.size()&&estenumar(expresie[i]))
                {
                    n*=10;
                    n+=expresie[i]-'0';
                    i++;

                }
                nr.push_back(n);
            }
            else
            {
                char d;
                d=operatori.top();
                while(prioritate(c,d))
                {
                    ret+=d;
                    operatori.pop();
                    d=operatori.top();
                }
                operatori.push(c);
                i++;
            }

        }


    }
    while(operatori.top()!='x')
	{
		c=operatori.top();
		if(c!=')')
			ret+=c;
		operatori.pop();
	}
    return ret;

}
int evaluare(string& fp)
{
    char c;
    int i=0,j=0;
    while(i<fp.size())
    {

        c=fp[i];
        if(c=='0')
            {
                operanzi.push(nr[j]);
                j++;
                i++;
            }
        else
        {
            int a, b,rez;
			b=operanzi.top();
			operanzi.pop();
			a=operanzi.top();
			operanzi.pop();
			switch(c)
			{
			case '+':rez=a+b; break;
			case '-':rez=a-b; break;
			case '*':rez=a*b;break;
			case '/':rez=a/b;break;
			}
			operanzi.push(rez);
			i++;
        }


    }
    return operanzi.top();
}
int main()
{
    string expresie,fp;
    ifstream fin("evaluare.in");
    ofstream fout("evaluare.out");
    getline(fin,expresie);
    fp=procesare(expresie);
    fout<<evaluare(fp)<<'\n';
    return 0;
}