#include <bits/stdc++.h>
using namespace std;
int main(){
int a1=0,sum=1,z=0,max=0;
string str;
cin>>str;
vector<int> v;
for (int i=2; i<str.size(); i++){
char a=str[i];
if (a=='('){a1++;z++;}
if (a==')'){a1--;z++;}
if (max<a1){max=a1;}
}
cout<<z-max;
}
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