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#include <iostream>
#include <vector>
#include <stack>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
string s;
cin >> s;
stack<char> st;
if (s.size() % 2 == 1)
cout << 0 << '\n';
else
{
int res = 1, ans = 0;
bool flag = true;
for (int i = 0; i < s.size(); i++)
{
if (s[i] == '(')
{
st.push('(');
res *= 2;
}
if (s[i] == '[')
{
st.push('[');
res *= 3;
}
{
flag = false;
break;
}
if (s[i] == ']')
{
if (s[i - 1] == '[')
{
ans += res;
}
st.pop();
res /= 3;
}
{
flag = false;
break;
}
if (s[i] == ')')
{
if (s[i - 1] == '(')
{
ans += res;
}
st.pop();
res /= 2;
}
}
if (!flag)
cout << 0 << '\n';
else
cout << ans << '\n';
}
return 0;
}
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BOJ/C++