ss = input()

x = ss[0]
op = ""
y = ""
for i in range(1, len(ss)):
    if(ss[i] == "+" or ss[i] == "-"):
        break
    x += ss[i]

op = ss[i]

y = ss[i + 1:]

if op == "+":
    print(int(x) - int(y))

else:
    print(int(x) + int(y))