S = input()
x = [S[0]]
y = []
i = 1
while S[i] not in ["+", "-"]:
    x.append(S[i])
    i += 1
x = int("".join(x))
op = S[i]
i += 1
while i < len(S):
    y.append(S[i])
    i += 1
y = int("".join(y))

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