#include <stack>
#include <cctype>
#include <cstdio>
#include <cstring>

using namespace std;

const int BUFF_SIZE = 65536 ;
char buffer [ BUFF_SIZE + 5 ] ;
int poz = BUFF_SIZE ;
char operators [] = "+-/*" ;

inline char getch ( FILE * f )
{
    if ( poz == BUFF_SIZE )
        fread ( buffer + 1 , 1 , BUFF_SIZE , f ) , poz = 0 ;
    return buffer [ ++ poz ] ;
}

inline int app_op ( int a , int b , char ch )
{
    if ( ch == '+' ) return a + b ;
    else if ( ch == '-' ) return b - a ;
    else if ( ch == '*' ) return a * b ;
    else if ( ch == '/' ) return b / a ;
}

inline int priority ( char a )
{
    if ( a == '(' ) return - 1 ;
    if ( a == '*' || a == '/' ) return 2 ;
    if ( a == '+' || a == '-' ) return 1 ;
    return 0 ;
}

int evaluate ( FILE * f )
{
    char ch ;
    int nr = 0 , val1 , val2 ;
    stack < int > num ;
    stack < char > ops ;

    while ( 1 )
    {
        ch = getch ( f ) ;

        here : ;

        if ( isdigit ( ch ) )
            nr = nr * 10 + ( int ) ( ch - '0' ) ;
        else
            if ( strchr ( operators , ch ) != NULL )
            {
                if ( nr ) num.push ( nr ) , nr = 0 ;

                char ch1 = ch ;

                while ( 1 )
                {
                    ch = getch ( f ) ;

                    if ( ! isdigit ( ch ) )
                        break ;

                    nr = nr * 10 + ( int ) ( ch - '0' ) ;
                }

                while ( ! ops.empty () && priority ( ch1 ) < priority ( ops.top () ) )
                {
                    val1 = num.top () ; num.pop () ;
                    val2 = num.top () ; num.pop () ;

                    num.push ( app_op ( val1 , val2 , ops.top () ) ) ;
                    ops.pop () ;
                }

                num.push ( nr ) ; nr = 0 ;
                ops.push ( ch1 ) ;

                goto here ;
            }
            else
                if ( ch == '(' )
                    ops.push ( ch ) ;
                else
                    if ( ch == ')' )
                    {
                        while ( ops.top () != '(' )
                        {
                            val1 = num.top () ; num.pop () ;
                            val2 = num.top () ; num.pop () ;

                            num.push ( app_op ( val1 , val2 , ops.top () ) ) ;

                            ops.pop () ;
                        }

                        ops.pop () ;
                    }
                    else
                        goto ending ;

    }

    ending : ;

    while ( ! ops.empty () )
    {
        val1 = num.top () ; num.pop () ;
        val2 = num.top () ; num.pop () ;

        num.push ( app_op ( val1 , val2 , ops.top () ) ) ;

        ops.pop () ;
    }

    return num.top () ;
}

int main()
{
    FILE * f ;
    f = fopen ( "evaluare.in" , "r" ) ;
    freopen ( "evaluare.out" , "w" , stdout ) ;

    printf ( "%d" , evaluate ( f ) ) ;

    return 0;
}