s = input()

for i in range(1,len(s)):
    if s[i] in ["+","-"]:
        a = s[:i]
        b = s[i]
        c = s[i+1:]
        break

a = "(" + a + ")"
c = "(" + c + ")"
if b == "+":
    b = "-"
else:
    b = "+"

print(eval(a+b+c))