#include <bits/stdc++.h>

using namespace std;

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int x = 0, y = 0, p = 0;
  string s;
  cin >> s;
  reverse(s.begin(), s.end());
  int b = 1;
  for (int i = 0; i < (int)s.size(); i++) {
    if ((s[i] == '+' || s[i] == '-') && !(s[i + 1] == '+' || s[i + 1] == '-')) {
      p = i;
      break;
    }
    if ((s[i] == '+' || s[i] == '-') && (s[i + 1] == '+' || s[i + 1] == '-')) {
      if (s[i] == '-') y *= -1;
    }
    y += (s[i] - '0') * b;
    b *= 10;
  }
  b = 1;
  for (int i = p + 1; i < (int)s.size(); i++) {
    if ((s[i] == '+' || s[i] == '-')) {
      if (s[i] == '-') x *= -1;
    }
    x += (s[i] - '0') * b;
    b *= 10;
  }
  if (s[p] == '-') {
    cout << x + y << '\n';
  } else {
    cout << x - y << '\n';
  }
  return 0;
}