def judgeint(s):
	if len(s) == 0: return False
	for i in range(1, len(s)):
		if s[i] == '+' or s[i] == '-': return False
	return True

S = raw_input()
op = []
for i in range(0, len(S)):
	if S[i] == '+' or S[i] == '-': op.append(i)
for i in range(0, len(op)):
	A = ''
	B = ''
	for j in range(0, op[i]):
		A = A + S[j]
	for j in range(op[i]+1, len(S)):
		B = B + S[j]
	if judgeint(A) and judgeint(B):
		if S[op[i]] == '+': print int(A) - int(B)
		else: print int(A) + int(B)
		break