import java.util.*;

public class Exercise89{
  public static void main (String[] args){

    Scanner sc = new Scanner(System.in);

    String s = sc.next();

    char[] sArray = s.toCharArray();
    char op = 'a';
    boolean num = false;
    int index = 0;

    for(int i = 0; i < sArray.length; i++){
      if(num && !Character.isLetterOrDigit(sArray[i])){
        op = sArray[i];
        index = i;
      }

      num = Character.isLetterOrDigit(sArray[i]);
    }
    int firstNum = Integer.parseInt(s.substring(0, index));
    int secondNum = Integer.parseInt(s.substring(index + 1, s.length()));

    System.out.println((op == '+') ? firstNum - secondNum : firstNum + secondNum);
  }
}