/* 
 * File:   main.cpp
 * Author: bitone
 *
 * Created on October 13, 2010, 2:34 PM
 */
#include <stack>
#include <string>
#include <fstream>
#include <cstdlib>

using namespace std;

/*
 * 
 */
string expresion;
inline int priority( char x )
{
    if( '(' == x )
        return -1;
    if( '+' == x || '-' == x )
        return 0;
    if( '*' == x || '/' == x )
        return 1;
    if( '^' == x )
        return 2;
    return 4;
}
inline void transform( string& expresion )
{
    int op;
    string t;
    stack< char > v;
    string::const_iterator it=expresion.begin(), iend=expresion.end();
    while( it < iend )
    {
        if( '0' <= *it && *it <= '9' )
        {
            for( ; it < iend && '0' <= *it && *it <= '9'; ++it )
                t.push_back(*it);
            t.push_back('/');
        }
        else if( '(' == *it )
                v.push(*it), ++it;
             else if( ')' == *it )
                  {
                       for( ++it; '(' != v.top(); t.push_back( v.top() ), v.pop() );
                       v.pop();
                  }
                  else {
                            for( op=priority(*it); !v.empty() && op <= priority(v.top()); t.push_back(v.top()), v.pop() );
                            v.push(*it);
                            ++it;
                       }
    }
    for( ; !v.empty(); t.push_back(v.top()), v.pop() );
    expresion=t;
}
inline int evaluate( void )
{
    transform(expresion);
    int number, a, b;
    stack< int > v;
    string::const_iterator it=expresion.begin(), iend=expresion.end();
    for( ; it < iend; ++it )
    {
        if( '0' <= *it && *it <= '9' )
        {
            for( number=0; it < iend && '0' <= *it && *it <= '9'; ++it )
                number=number*10+*it-'0';
            v.push(number);
        }
        else {
                b=v.top(); v.pop();
                a=v.top(); v.pop();
                switch(*it)
                {
                    case '+' : v.push(a+b); break;
                    case '-' : v.push(a-b); break;
                    case '*' : v.push(a*b); break;
                    case '/' : v.push(a/b); break;
                }
             }
    }
    return v.top();
}
int main(int argc, char** argv)
{
    ifstream in( "evaluare.in" );
    getline( in, expresion );
    ofstream out( "evaluare.out" );
    out<<evaluate()<<'\n';
    return EXIT_SUCCESS;
}