#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  string s;
  cin >> s;
  rep(i, s.size() - 1) {
    if (isdigit(s[i]) && !isdigit(s[i + 1])) {
      char op = s[i + 1];
      int a = stoi(s.substr(0, i + 1));
      int b = stoi(s.substr(i + 2));
      Debug(a, op, b);
      if (op == '-') {
        cout << a + b << endl;
      }
      else {
        assert(op == '+');
        cout << a - b << endl;
      }
      return 0;
    }
  }
  assert(false);
  return 0;
}