2003找到牛！

include [HTML_REMOVED]

using namespace std;
int main()
{
string str;
cin>>str;
int ans=0, cnt=0;
for(int i=1; i<str.size(); i)
{
if(str[i-1]==’(‘ && str[i]==’(‘) cnt;
else if(str[i-1]==’)’ && str[i]==’)’) ans+=cnt;
}
cout<<ans;
return 0;
}