# coding:utf-8
xopy = input()
import re
x = re.search("^[+-]?[0-9]+", xopy)
op = re.search("(?<=[0-9])[+-]", xopy)
y = re.search("(?<=[+-])[+-]?[0-9]+$", xopy)
x = int(x.group())
y = int(y.group())
# print(x, y)
# print(op)
if op.group()=="+":
    print(x-y)
else:
    print(x+y)