import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] line = sc.next().toCharArray();
		sc.close();
		long max = 0;
		for (int q = 0; q < line.length; q++) {
			if (Character.isDigit(line[0]) && Character.isDigit(line[line.length - 1])) {

				long sum = 0;

				boolean plus = true;
				StringBuilder sb = new StringBuilder();
				for (int i = 0; i < line.length; i++) {
					if (Character.isDigit(line[i])) {
						sb.append(line[i]);
					} else {
						if (plus) {
							sum += Long.parseLong(sb.toString());
						} else {
							sum -= Long.parseLong(sb.toString());
						}

						sb.setLength(0);
						if (line[i] == '+') {
							plus = true;
						} else {
							plus = false;
						}
					}
				}
				if (plus) {
					sum += Long.parseLong(sb.toString());
				} else {
					sum -= Long.parseLong(sb.toString());
				}
				max = Math.max(max, sum);

			}

			char tmp = line[0];
			for (int i = 1; i < line.length; i++) {
				line[i - 1] = line[i];
			}
			line[line.length - 1] = tmp;

		}
		System.out.println(max);
	}
}