import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String get = sc.next();
        int count = 0;

        for (int i = 1; i < get.length(); i++) {
            if (! Character.isDigit(get.charAt(i))) {
                count = i;
                break;
            }
        }

        int a = Integer.parseInt(get.substring(0, count));
        int b = Integer.parseInt(get.substring(count + 1, get.length()));
        char op = get.charAt(count);

        int ans;

        if (op == '+') {
            ans = a - b;
        } else {
            ans = a + b;
        }

        System.out.println(ans);
    }
}