#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N; cin >> N;
    vector<tuple<char,int,int>> LR(2*N);
    for(auto &[c,l,r] : LR) cin >> c >> l >> r;
    long long answer = 0;
    priority_queue<int> Q;
    int okl = 0,okr = 0;
    for(int i=2*N; i--;){
        auto [c,l,r] = LR.at(i);
        if(c == ')'){
            if(l <= r) okr++,answer += r;
            else okl--,answer += l,Q.push(r-l);
        }
        else{
            if(l >= r) okl++,answer += l;
            else okr--,answer += r,Q.push(l-r);
        }
        if(okl < 0 || okr < 0){
            answer += Q.top(); Q.pop();
            okl++; okr++;
        }
        
    }
    cout << answer << endl;
}