#include <iostream>
#include <cstdio>
#include <cstring>
#include <stack>
#include <cstdlib>

using namespace std;

const int mx = 100005 ;

int n,p ;
char s[mx] ;
char polo[mx][12] ;

int val( char c )
{
    if ( c == '(' || c == ')' )
        return 0 ;
    if ( c == '+' || c == '-' )
        return 1 ;
    return 2 ;
}

void poloneza()
{
    stack <char> S;
    int i = 0 ;

    while ( i < n )
        if ( isdigit(s[i]) )
        {
            int t = 0 ;
            while ( isdigit(s[i]) )
                polo[p][t++] = s[i++] ;
            p ++ ;
        }
        else if ( s[i] == '(' )
            S.push(s[i++]) ;
        else
        {
            while ( not S.empty() && val(s[i]) <= val(S.top())  )
            {
                if ( S.top() != '(' )
                    polo[p++][0] = S.top() ;
                S.pop() ;
            }
            if ( s[i] != ')' )
                S.push(s[i]) ;
            i ++ ;
        }
    while ( not S.empty() )
    {
        if ( S.top() != '(' )
            polo[p++][0] = S.top() ;
        S.pop() ;
    }
}

int rez( int a , int b , char s )
{
    if ( s == '+' )
        return a + b ;
    if ( s == '-' )
        return a - b ;
    if ( s == '*' )
        return a * b ;
    return a / b ;
}

void evaluare()
{
    stack <int> S;
    for ( int i = 0 ; i < p ; i ++ )
        if ( isdigit(polo[i][0]) )
             S.push( atoi( polo[i] ) ) ;
        else
        {
            int a = S.top() ;
            S.pop() ;
            int b = S.top() ;
            S.pop() ;
            S.push(rez(b , a , polo[i][0])) ;
        }
    printf( "%d\n" , S.top() ) ;
}

int main()
{
    freopen( "evaluare.in" , "r" , stdin ) ;
    freopen( "evaluare.out" , "w" , stdout ) ;

    scanf( "%s" , s ) ;
    n = strlen(s) ;

    poloneza() ;
    evaluare() ;

    return 0;
}