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

int main(int argc, char *argv[]){
  string s;
  cin >> s;
  int a, b;
  char c;
  sscanf(s.c_str(), "%d%c%d", &a, &c, &b);
  if(c =='+'){
    std::cout << a - b << std::endl;
  }else{
    std::cout << a + b << std::endl;
  }
  return 0;
}