import re
xopy = input()

calc = re.findall(r'\+|-|\d+', xopy)

for i, v in enumerate(calc):
    if v.isdigit():
        idx = i + 1
        break

if calc[idx] == '+':
    calc[idx] = '-'
else:
    calc[idx] = '+'

ans = ''.join(calc)
print(eval(ans))