#include <iostream>
#include <sstream>
#include <cstring>
#include <string>
#include <algorithm>
#include <cmath>
#include <map>
#include <set>
#include <vector>
#include <queue> 
#include <unordered_set>
#include <unordered_map>
#include <bitset>
#include <ctime>
#include <assert.h>
#include <deque>
#include <list>
#include <stack>
#include <numeric>
#include <iomanip>

using namespace std;
 
typedef pair<long long, int> pli;
typedef pair<int, long long> pil;
typedef pair<long long , long long> pll;
typedef pair<int, int> pii;
typedef pair<double, double> pdd;
typedef pair<int, pii> piii;
typedef pair<int, long long > pil;
typedef pair<long long, pii> plii;
typedef pair<double, int> pdi;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ull, ull> puu;
typedef long double ld;
const int N = 2000086, MOD = 998244353, INF = 0x3f3f3f3f, MID = 333;
const long double EPS = 1e-9;
int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
// int dx[8] = {1, 1, 0, -1, -1, -1, 0, 1}, dy[8] = {0, 1, 1, 1, 0, -1, -1, -1};
// int dx[8] = {2, 1, -1, -2, -2, -1, 1, 2}, dy[8] = {1, 2, 2, 1, -1, -2, -2, -1};
int n, m, cnt;
int w[N];
vector<ll> num;
ll res;

ll lowbit(ll x) { return x & -x; }
ll lcm(ll a, ll b) { return a / __gcd(a, b) * b; }
inline double rand(double l, double r) { return (double)rand() / RAND_MAX * (r - l) + l; }
inline ll qmi(ll a, ll b, ll c) { ll res = 1; while (b) { if (b & 1) res = res * a % c; a = a * a % c; b >>= 1; } return res; }
inline ll qmi(ll a, ll b) { ll res = 1; while (b) { if (b & 1) res *= a; a *= a; b >>= 1; } return res; }
inline double qmi(double a, ll b) { double res = 1; while (b) { if (b & 1) res *= a; a *= a; b >>= 1; } return res; } 
inline ll C(ll a, ll b, int* c) { if (a < b) return 0; ll res = 1; for (ll j = a, i = 1; i < b + 1; i++, j--) res *= j; for (ll j = a, i = 1; i < b + 1; i++, j--) res /= i; return res; }
inline int find_(int x) { return lower_bound(num.begin(), num.end(), x) - num.begin(); }

char ch[N][2];
int l[N], r[N];

int main() {
    cin >> n;
    n <<= 1;
    for (int i = 1; i < n + 1; i++) scanf("%s%d%d", ch[i], l + i, r + i), res += ch[i][0] == '(' ? l[i] : r[i];

    int lc = 0, rc = 0;
    priority_queue<int, vector<int>, greater<int> > q;
    for (int i = n; i; i--) {
        if (ch[i][0] == '(') {
            lc++;
            if (q.size() < min(lc, rc) && r[i] > l[i]) q.push({r[i] - l[i]}), res += r[i] - l[i];
            else if (q.size() && q.top() < r[i] - l[i]) {
                res -= q.top();
                q.pop();
                res += r[i] - l[i];
                q.push({r[i] - l[i]});
            }
        } else {
            rc++;
            if (q.size() < min(lc, rc) && l[i] > r[i]) q.push({l[i] - r[i]}), res += l[i] - r[i];
            else if (q.size() && q.top() < l[i] - r[i]) {
                res -= q.top();
                q.pop();
                res += l[i] - r[i];
                q.push({l[i] - r[i]});
            }
        }
    }
    printf("%lld\n", res);
    return 0;
}