import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;

class Main {
	static PrintWriter out = new PrintWriter(System.out);
	static String str;

	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str = br.readLine();
		br.close();

		int len = str.length();
		String result = "";
		boolean flag = false;
		int point = 0;

		for (int i = 0; i < len; i++) {
			if (str.charAt(i) == '+') {
				result += "-";
				if (flag) {
					flag = false;
					point = result.length();
				}
			} else if (str.charAt(i) == '-') {
				if (flag) {
					result += "+";
					flag = false;
					point = result.length();
				} else {

				}
			} else {
				result += str.substring(i, i + 1);
				if (point == 0) {
					flag = true;
				}
			}
		}
		if (result.indexOf("+") > 0) {
			System.out.println(
					Integer.parseInt(result.substring(0, point-1)) + Integer.parseInt(result.substring(point)));
		} else {
			System.out.println(
					Integer.parseInt(result.substring(0, point-1)) - Integer.parseInt(result.substring(point)));
		}
	}
}