import java.awt.Point;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.*;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentSkipListSet;

public class Main {
	public static final int C =  1000000007;
	static final int CY = 1000000000;

	public void calc() {
		StringBuilder sb = new StringBuilder();
		BufferedInputStream bs = new BufferedInputStream(System.in);
		Scanner sc = new Scanner(bs);

		String s = sc.next();
		
		int ans = 0;
		//double ans = 0.0;

		for (int i=0; i < s.length(); i++) {
			String ns = "";
			ns += s.substring(i);
			ns += s.substring(0, i);
			ans = Math.max(ans, msd(ns));
		}
		

		System.out.println(ans);

	}

	int msd(String s) {
		if (s.endsWith("+") || s.endsWith("-") || s.startsWith("+") || s.startsWith("-")) {
			return -1;
		}
		int ret = 0;
		
		String[] ss = s.split("\\+");
		for (String str: ss) {
			int num = 0;
			String[] sst = str.split("-");
			for (int i=0; i < sst.length;i++) {
				if (i==0) {
					num += Integer.parseInt(sst[i]);
				}else {
					num -= Integer.parseInt(sst[i]);
				}
			}
			ret += num;
		}
		
		return ret;
		
	}


	public static void main(String[] args) {
		Main main = new Main();
		main.calc();

	}
}