import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

s = S()

for i in range(1, len(s)):
    if s[i] == '+':
        ans = int(s[:i]) - int(s[i+1:])
        break
    if s[i] == '-':
        ans = int(s[:i]) + int(s[i+1:])
        break

print(ans)