from collections import deque
s = input()
total = 0
done = [0]*len(s)
lefts,rights = deque(),deque()

#get ( ) position
for i in range(len(s)):
    if s[i] == '(':
        lefts.append(i)
    elif s[i] == ')':
        rights.append(i)

#calc in ( )
while 0 < len(lefts):
    l = lefts.popleft()
    r = rights.popleft()
    done[l-1],done[l],done[r] = 1,1,1
    tmp = 0
    sign = '+'
    for j in range(l+1,r):
        done[j] = 1
        if s[j] == '+' or s[j] == '-':
            sign = s[j]
        else:
            if sign == '+':
                tmp += int(s[j])
            else:
                tmp -= int(s[j])
    if s[l-1] == '+':
        total += tmp
    else:
        total -= tmp

#calc all
sign = '+'
for x in range(len(s)):
    if done[x] == 0:
        if s[x] == '+' or s[x] == '-':
            sign = s[x]
        else:
            if sign == '+':
                total += int(s[x])
            else:
                total -= int(s[x])
print(total)