#include <iostream>
#include <cstdlib>
using namespace std;

int conv(string str){
  int result, n = str.size();
  if(str[0] == '+')
    return stoi(str.substr(1, n - 1));
  if(str[0] == '-')
    return stoi(str.substr(1, n - 1)) * (-1);
  return stoi(str);
}

int main(){
  string xx, yy, op, str;
  int opnum, xnum, ynum;
  cin >> str;
  for(int i = 1; i < str.size(); i++){
    if(str[i] == '+' || str[i] == '-'){
      opnum = i;
      break;
    }
  }
  op = str[opnum];
  xx = str.substr(0, opnum);
  yy = str.substr(opnum + 1, str.size() - opnum - 1);

  xnum = conv(xx);
  ynum = conv(yy);

  if(op == "+")
    cout << xnum - ynum << endl;
  else
    cout << xnum + ynum << endl;
}