import string

S = input()
N = len(S)
p = 0

def parse_int():
    global p
    l = p
    if S[p] in '+-':
        p += 1
    while p < N and S[p] in string.digits:
        p += 1
    return int(S[l:p])

def parse_op():
    global p
    op = S[p]
    p += 1
    return op

x = parse_int()
op = parse_op()
y = parse_int()
ans = x + y if op == '-' else x - y

print(ans)