#include <fstream>
#include <string>
#include <stack>

using namespace std;
ifstream fin("evaluare.in");
ofstream fout("evaluare.out");
string s;
stack <char>operatori;
stack <int>numere;
//un operator se adauga in varful stivei daca :
//1. stiva este goala
//2. in varful stivei este '('
//3. in varful stivei este un operator cu prioritate strict mai mica decat operatorul curent
inline int prio(char ch)
{
    switch(ch)
    {
    case '*': return 3;
    case '/': return 2;
    case '-': return 1;
    case '+': return 5;
    default: return 4;
    }
}

int main()
{
    long long nr=0, nr1=0, nr2=0;
    char ch;
    fin>>s;
    operatori.push('(');
    s.push_back(')');
    for(int i=0;i<s.size();i++)
    {
       // if(!numere.empty())
            //fout<<numere.top()<<"\n";
        if(s[i]>='0' and s[i]<='9')
        {
            nr=0;
            while(s[i]>='0' and s[i]<='9')
            {
               nr=nr*10+(s[i]-'0');
               i++;
            }
            i--;
            numere.push(nr);
            continue;
        }
        else
        {
            if(s[i]=='(')
            {
                operatori.push(s[i]);
                continue;
            }
            else
            {
                if(s[i]==')')
                {
                    while(operatori.top()!='(')
                    {
                       nr1=numere.top();
                       numere.pop();
                       nr2=numere.top();
                       numere.pop();
                       ch=operatori.top();
                       operatori.pop();
                       if(ch=='+')
                       {
                           nr1=nr2+nr1;
                       }
                       if(ch=='-')
                       {
                           nr1=nr2-nr1;
                       }
                       if(ch=='*')
                       {
                           nr1=nr1*nr2;
                       }
                       if(ch=='/')
                       {
                           nr1=nr2/nr1;
                       }
                       numere.push(nr1);
                    }
                    operatori.pop();
                    continue;
                }
                else
                {
                    ch=s[i];
                     if(prio(ch)>prio(operatori.top()))
                     {
                         operatori.push(s[i]);
                         continue;
                     }
                     else
                     {
                         nr1=0;
                         i++;
                         while(s[i]>='0' and s[i]<='9')
                         {
                             nr1=nr1*10+(s[i]-'0');
                             i++;
                         }
                         i--;
                         nr2=numere.top();
                         numere.pop();
                         if(ch=='+')
                         {
                           nr1=nr2+nr1;
                         }
                         if(ch=='-')
                         {
                           nr1=nr2-nr1;
                         }
                         if(ch=='*')
                         {
                           nr1=nr1*nr2;
                         }
                         if(ch=='/')
                         {
                           nr1=nr2/nr1;
                         }
                          numere.push(nr1);
                          continue;
                     }
                }
            }
        }
    }
    fout<<numere.top()<<"\n";
    return 0;
}