import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		String s = scan.next();
		scan.close();
		int l = s.length();
		int x = 0;
		int y = 0;
		int a = 0;

		if(s.charAt(0) == '-') {
			a = 1;
		}
		char c2 = '+';

		int b = 0;
		for(int i = a; i < l; i++) {
			if(s.charAt(i) == '-' || s.charAt(i) == '+') {
				x = Integer.parseInt(s.substring(a, i));
				if(s.charAt(i + 1) == '+') {
					b = i;
					c2 = s.charAt(i);
					y = Integer.parseInt(s.substring(b + 2, l));
					break;
				}else if(s.charAt(i + 1) == '-' ){
					b = i;
					c2 = s.charAt(i);
					y = -Integer.parseInt(s.substring(b + 2, l));
					break;
				}
				b = i;
				c2 = s.charAt(i);
				y = Integer.parseInt(s.substring(b + 1, l));
				break;
			}
		}
		if(a == 1) {
			x = - x;
		}
		if(c2 == '+') {
			System.out.println(x - y);
		}else {
			System.out.println(x + y);
		}
	}
}