s = str(input())
for i in range(1, len(s)):
    if not s[i].isdecimal() and s[i-1].isdecimal():
        op = s[i]
        break
if op == '+':
    ans = int(s[0:i])-int(s[i+1:])
else:
    ans = int(s[0:i])+int(s[i+1:])
print(ans)