# -*- coding: utf-8 -*-
"""
No.222 引き算と足し算
https://yukicoder.me/problems/no/222

"""
import sys
from sys import stdin
import re
input = stdin.readline


def solve(e):
    m = re.search('\D', e[1:])
    pos = m.start() + 1
    if e[pos] == '-':
        t = e[:pos] + '+' + e[pos+1:]
    else:
        t = e[:pos] + '-' + e[pos+1:]
    return eval(t)


def main(args):
    e = input().strip()
    ans = solve(e)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])