import sys
import math
import bisect
from heapq import heapify, heappop, heappush
from collections import deque, defaultdict, Counter
from functools import lru_cache
from itertools import accumulate, combinations, permutations, product

sys.set_int_max_str_digits(10 ** 6)
sys.setrecursionlimit(1000000)
MOD = 10 ** 9 + 7
MOD99 = 998244353

input = lambda: sys.stdin.readline().strip()
NI = lambda: int(input())
NMI = lambda: map(int, input().split())
NLI = lambda: list(NMI())
SI = lambda: input()
SMI = lambda: input().split()
SLI = lambda: list(SMI())
EI = lambda m: [NLI() for _ in range(m)]


def main():
    S = SI()
    if "++" in S:
        x, y = S.split("++")
        print(int(x) - int(y))
    elif "+-" in S:
        x, y = S.split("+-")
        print(int(x) + int(y))
    elif "-+" in S:
        x, y = S.split("-+")
        print(int(x) + int(y))
    elif "--" in S:
        x, y = S.split("--")
        print(int(x) - int(y))
    else:
        op = ""
        idx = 0
        for i, s in enumerate(S[1:], start=1):
            if s in "+-":
                op = s
                idx = i
                break
        if op == "+":
            print(int(S[:idx]) - int(S[idx+1:]))
        else:
            print(int(S[:idx]) + int(S[idx + 1:]))


if __name__ == "__main__":
    main()