/* 
 * File:   main.cpp
 * Author: virtualdemon
 *
 * Created on April 25, 2010, 6:43 PM
 */
#include <stack>
#include <string>
#include <cstdlib>
#include <fstream>

/*
 * 
 */
using namespace std;
string t, expresion;
string::const_iterator it, iend;
inline int priority( char op )
{
    if( '(' == op )
        return 0;
    if( '+' == op || '-' == op )
        return 1;
    if( '*' == op || '/' == op )
        return 2;
    return 5;
}
inline void transform( void )
{
    int p;
    stack< char > s;
    it=expresion.begin();
    iend=expresion.end();
    for( ; it < iend;  )
    {
        if( *it >= '0' && *it <= '9' )
        {
            for( ; it < iend && *it >= '0' && *it <= '9'; ++it )
                t.push_back(*it);
            t.push_back('.');
            continue;
        }
        if( '(' == *it )
        {
            s.push(*it);
            ++it;
            continue;
        }
        if( ')' == *it )
        {
            for( ++it; '(' != s.top(); s.pop() )
                t.push_back(s.top());
            s.pop();
            continue;
        }
        for( p=priority( *it ); !s.empty() && p <= priority(s.top()); s.pop() )
            t.push_back( s.top() );
        s.push(*it);
        ++it;
    }
    for( ; !s.empty(); s.pop() )
        t.push_back( s.top() );
}
inline int eval( void )
{
    stack< int > s;
    int number, a, b;
    transform();
    for( it=t.begin(), iend=t.end(); it < iend; ++it )
    {
        if( *it >= '0' && *it <= '9' )
        {
            for( number=0; *it >= '0' && *it <= '9'; ++it )
                number=number*10+*it-'0';
             s.push(number);
             continue;
        }
        b=s.top(); s.pop();
        a=s.top(); s.pop();
        switch( *it )
        {
            case '+' : s.push(a+b); break;
            case '-' : s.push(a-b); break;
            case '*' : s.push(a*b); break;
            case '/' : s.push(a/b); break;
        }
    }
    return s.top();
}
int main(int argc, char** argv)
{
    ifstream in( "evaluare.in" );
    ofstream out( "evaluare.out" );
    getline( in, expresion );
    out<<eval()<<'\n';
    return (EXIT_SUCCESS);
}