S = input().rstrip()
x, y, op = "", "", ""
for i in range(len(S)):
    if i != 0 and (S[i] == "+" or S[i] == "-"):
        x = S[0:i]
        y = S[i + 1:]
        op = S[i]
        break
x, y = int(x), int(y)
if op == "+":
    print(x - y)
else:
    print(x + y)