S = input()
N = len(S)
ans = -10 ** 10
for i in range(N):
    x = 1
    y = ''
    a = 0
    for j in range(i + 1 - N, i + 1):
        if S[j] == '+':
            if y:
                a += x * int(y)
                x = 1
                y = ''
            else:
                a = -10**10
                break
        elif S[j] == '-':
            if y:
                a += x * int(y)
                x = -1
                y = ''
            else:
                a = -10**10
                break
        else:
            y += S[j]
    if y:
        a += x * int(y)
        ans = max(ans, a)
        
print(ans)