s = list(input())

for i in range(len(s)-1):
    if s[i].isdigit() == True and s[i+1].isdigit() == False:
        x = i+1

if s[x] == '+':
    s[x] = '-'
else:
    s[x] = '+'
s = ''.join(s)

s = s.replace('--', '+')
s = s.replace('+-', '-')
s = s.replace('-+', '-')
s = s.replace('++', '+')
print(eval(s))