#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import re


def calc(input_str):
    pattern = re.compile("(?P<x>[\+\-]?\d+)(?P<op>[\+\-])(?P<y>[\+\-]?\d+)")
    match_obj = pattern.match(input_str)
    x = int(match_obj.group("x"))
    y = int(match_obj.group("y"))
    op = match_obj.group("op")
    if op == "+":
        return x - y
    else:
        return x + y


if __name__ == "__main__":
    print(calc(input()))