x = input().strip()
import re
#print(x)
c = re.match("^([+-]*)(\d+)([+-]*)(\d+)$", x)
#print(c.group(3))
a, b = int(c.group(2)), int(c.group(4))
#print(a, b)
if x[0] == "-":
    a = -a
if len(c.group(3)) == 2 and c.group(3)[1] == "-":
    b = -b
if c.group(3)[0] == "+":
    print(a-b)
else:
    print(a+b)