/* -*- coding: utf-8 -*-
 *
 * 708.cc: No.708 (+ー)の式 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

char s[128];

/* subroutines */

int expr(char *(&cpt));

int term(char *(&cpt)) {
  if (*cpt == '(') {
    cpt++; // '('
    int r = expr(cpt);
    cpt++; // ')'
    return r;
  }
  return *(cpt++) - '0';
}

int expr(char *(&cpt)) {
  int r = term(cpt);
  while (*cpt == '+' || *cpt == '-') {
    char op = *(cpt++);
    int r1 = term(cpt);
    if (op == '+') r += r1;
    else r -= r1;
  }
  return r;
}

/* main */

int main() {
  scanf("%s", s);

  char *cpt = s;
  printf("%d\n", expr(cpt));
  return 0;
}