import sys

line = sys.stdin.readline()

stack = []

def bracket_calculate(bracket: str):

result = 0

tmp = 1

for i in range(len(bracket)):

if bracket[i] == '(':

stack.append(bracket[i])

tmp *= 2

elif bracket[i] == '[':

stack.append(bracket[i])

tmp *= 3

elif bracket[i] == ')':

if not stack or stack[-1] != '(':

return 0

if bracket[i-1] == '(':

result += tmp

stack.pop()

tmp = tmp // 2

elif bracket[i] == ']':

if not stack or stack[-1] != '[':

return 0

if bracket[i-1] == '[':

result += tmp

stack.pop()

tmp = tmp // 3

if stack:

return 0

else:

return result

print(bracket_calculate(line))