/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <fstream>
#include <cstring>
#include <stack>
#include <unordered_map>
using namespace std;
ifstream cin("evaluare.in");
ofstream cout("evaluare.out");
char s[100005];
stack<char> operatori;
stack<int> numere;
unordered_map<char,int> m;
int i,n;
int solve(int x,int y,char o)
{
    switch(o)
    {
        case '+':
            return x+y;
            case '-':
               return y-x;
              case '*':
                return x*y;
        case '/':
           return y/x;
     }
return -3243;
}
bool cifra(char x)
{
    if(x>='0' && x<='9')
       return 1;
       else
         return 0;
}
void prioritati()
{
    m['+']=1;
    m['-']=1;
    m['*']=2;
    m['/']=2;
}
int formare()
{
    int nou=0;
    while(cifra(s[i]) && i<n)
    {
        nou=nou*10+(s[i]-'0');
        i++;
    }
    i--;
    return nou;
}
void nebunie()
{
    int x=numere.top();
    numere.pop();
    int y=numere.top();
    numere.pop();
    char o=operatori.top();
    operatori.pop();
    numere.push(solve(x,y,o));
}
int main()
{
    prioritati();
    cin>>s;
    n=strlen(s);
   for(i=0;i<n;i++)
   {
       if(cifra(s[i]))
       {
           int nou=formare();
           numere.push(nou);
       }
       else
          if(s[i]=='(')
              operatori.push('(');
              else
                 if(s[i]==')')
                     {
                         while(operatori.top()!='(' && !operatori.empty())
                            nebunie();
                         if(operatori.empty()==0)
                            operatori.pop();
                     }
                     else
                       {
                           while(!operatori.empty() && m[operatori.top()]>=m[s[i]])
                              nebunie();
                           operatori.push(s[i]);
                       }
   }
   while(!operatori.empty())
       nebunie();
   cout<<numere.top();
    return 0;
}