#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF (1LL<<25)     //33554432
#define PI 3.14159265359
#define EPS 1e-12
//#define int ll

signed main(void)
{
  string s, a, b;
  cin >> s;
  bool plus = false, flag = false;
  REP(i, s.size()) {
    if(s[i] >= '0' && s[i] <= '9') flag = true;
    if(flag && s[i] == '+') {
      plus = true;
      a = s.substr(0, i);
      b = s.substr(i+1, s.size()-i-1);
      break;
    }
    if(flag && s[i] == '-') {
      plus = false;
      a = s.substr(0, i);
      b = s.substr(i+1, s.size()-i-1);
      break;
    }
  }

  int c, d;
  bool e = false, f = false;
  if(a[0] == '-') {
    e = true;
    a = a.substr(1, a.size()-1);
  }
  if(a[0] == '+') {
    a.substr(1, a.size()-1);
  }
  c = stoi(a);
  if(e) c *= -1;

  if(b[0] == '-') {
    f = true;
    b = b.substr(1, b.size()-1);
  }
  if(b[0] == '+') {
    b.substr(1, b.size()-1);
  }
  d = stoi(b);
  if(f) d *= -1;

  //cout << c << " " << d << endl;
  if(plus) {
    cout << c-d << endl;
  } else {
    cout << c+d << endl;
  }

  return 0;
}