import java.util.Scanner;


public class Main_yukicoder193 {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String s = sc.next();
        int n = s.length();
        s = s + s;

        int max = Integer.MIN_VALUE;
        for (int i = 0; i < n; i++) {
        	max = Math.max(max, calc(s.substring(i, i + n)));
        }

        System.out.println(max);

        sc.close();
    }

	private static int calc(String str) {
		int n = str.length();
		if (str.charAt(0) == '+' || str.charAt(0) == '-') {
			return Integer.MIN_VALUE;
		}
		if (str.charAt(n - 1) == '+' || str.charAt(n - 1) == '-') {
			return Integer.MIN_VALUE;
		}

		int i;
		int j = 0;
		int ret = 0;
		for (i = 0; i < str.length(); i++) {
			char c = str.charAt(i);
			if (c == '+' || c == '-') {
				int tmp = Integer.parseInt(str.substring(j, i));
				ret += tmp;
				j = i;
			}
		}

		int tmp = Integer.parseInt(str.substring(j, i));
		ret += tmp;

		return ret;
	}
}