S = input()
N = len(S)
ind = -1
for i in range(N - 1):
    if str.isdigit(S[i]) and not str.isdigit(S[i + 1]):
        ind = i + 1
op = S[ind]
a = int(S[:ind])
b = int(S[ind + 1:])
if op == "+":
    print(a - b)
else:
    print(a + b)