#include<bits/stdc++.h>
using namespace std;


string S;

int read_exp(int &i);

int read_term(int &i){
  cerr << i << "÷\n";
  if('0' <= S[i] && S[i] <= '9'){
    return S[i++] - '0';
  }else{
    assert(S[i] == '(');
    i++;
    int ret = read_exp(i);
    assert(S[i++] == ')');
    return ret;
  }
}

int read_exp(int &i){
  cerr << i << "\n";
  int ret1 = read_term(i);
  cerr << ret1 << " " << i << "\n";
  while(i < S.size()){
    assert(S[i] == '+' || S[i] == '-');
    char op = S[i++];
    int ret2 = read_term(i);
    cerr << i << " " << ret1 << " " << ret2 << "\n";
    if(op == '+'){
      ret1 += ret2;
    }else{
      ret1 -= ret2;
    }
    if(S[i] == ')'){
      break;
    }
  }
  return ret1;
}

int main(){
  int index = 0;
  cin >> S;
  cout << read_exp(index) << "\n";
}