s = input()
if s.find("+-") != -1:
    s = s.replace("+-", "--")
elif s.find("--") != -1:
    s = s.replace("--", "+-")
elif s.find("++") != -1:
    s = s.replace("++", "-+")
elif s.find("-+") != -1:
    s = s.replace("-+", "++")
else:
    l = len(s) - 1
    while True:
        if s[l] == '+':
            s = s[:l] + '-' + s[l+1:]
            break
        if s[l] == '-':
            s = s[:l] + '+' + s[l+1:]
            break
        l -= 1
print(eval(s))