S = raw_input()
ans = 0
tmp = ''
flag = 0
for i in range(0, len(S)):
	if S[i] != '*' and S[i] != '+':
		tmp = tmp + S[i]
	else:
		if flag == 0: ans += int(tmp)
		else: ans *= int(tmp)

		if S[i] == '*': flag = 0
		else: flag = 1
		tmp = ''
	if i == len(S)-1:
		if flag == 0: ans += int(tmp)
		else: ans *= int(tmp)
print ans