Problem: One day, Hongcow goes to the store and sees a brand new deck of n special cards. Each individual card is either red or blue. He decides he wants to buy them immediately. To do this, he needs to play a game with the owner of the store.

This game takes some number of turns to complete. On a turn, Hongcow may do one of two things: 

  * Collect tokens. Hongcow collects 1 red token and 1 blue token by choosing this option (thus, 2 tokens in total per one operation). 
  * Buy a card. Hongcow chooses some card and spends tokens to purchase it as specified below. 



The i-th card requires ri red resources and bi blue resources. Suppose Hongcow currently has A red cards and B blue cards. Then, the i-th card will require Hongcow to spend max(ri - A, 0) red tokens, and max(bi - B, 0) blue tokens. Note, only tokens disappear, but the cards stay with Hongcow forever. Each card can be bought only once.

Given a description of the cards and their costs determine the minimum number of turns Hongcow needs to purchase all cards.

Input

The first line of input will contain a single integer n (1 ≤ n ≤ 16).

The next n lines of input will contain three tokens ci, ri and bi. ci will be 'R' or 'B', denoting the color of the card as red or blue. ri will be an integer denoting the amount of red resources required to obtain the card, and bi will be an integer denoting the amount of blue resources required to obtain the card (0 ≤ ri, bi ≤ 107).

Output

Output a single integer, denoting the minimum number of turns needed to acquire all the cards.

Examples

Input

3
R 0 1
B 1 0
R 1 1


Output

4


Input

3
R 3 0
R 2 0
R 1 0


Output

6

Note

For the first sample, Hongcow's four moves are as follows: 

  1. Collect tokens 
  2. Buy card 1
  3. Buy card 2
  4. Buy card 3

Note, at the fourth step, Hongcow is able to buy card 3 because Hongcow already has one red and one blue card, so we don't need to collect tokens.

For the second sample, one optimal strategy is as follows: 

  1. Collect tokens 
  2. Collect tokens 
  3. Buy card 2
  4. Collect tokens 
  5. Buy card 3
  6. Buy card 1

At the fifth step, even though Hongcow has a red token, Hongcow doesn't actually need to spend it, since Hongcow has a red card already.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
const double pi = acos(0.0) * 2.0;
const long double eps = 1e-10;
const int step[8][2] = {{-1, 0}, {0, 1}, {1, 0},  {0, -1},
                        {-1, 1}, {1, 1}, {1, -1}, {-1, -1}};
template <class T>
inline T abs1(T a) {
  return a < 0 ? -a : a;
}
template <typename t, typename t1>
t min1(t a, t1 b) {
  return a < b ? a : b;
}
template <typename t, typename... arg>
t min1(t a, arg... arr) {
  return min1(a, min1(arr...));
}
template <typename t, typename t1>
t max1(t a, t1 b) {
  return a > b ? a : b;
}
template <typename t, typename... arg>
t max1(t a, arg... arr) {
  return max1(a, max1(arr...));
}
inline int jud(double a, double b) {
  if (abs(a) < eps && abs(b) < eps)
    return 0;
  else if (abs1(a - b) / max(abs1(a), abs1(b)) < eps)
    return 0;
  if (a < b) return -1;
  return 1;
}
template <typename t>
inline int jud(t a, t b) {
  if (a < b) return -1;
  if (a == b) return 0;
  return 1;
}
template <typename it, typename t1>
inline int find(t1 val, it a, int na, bool f_small = 1, bool f_lb = 1) {
  if (na == 0) return 0;
  int be = 0, en = na - 1;
  if (*a <= *(a + na - 1)) {
    if (f_lb == 0)
      while (be < en) {
        int mid = (be + en + 1) / 2;
        if (jud(*(a + mid), val) != 1)
          be = mid;
        else
          en = mid - 1;
      }
    else
      while (be < en) {
        int mid = (be + en) / 2;
        if (jud(*(a + mid), val) != -1)
          en = mid;
        else
          be = mid + 1;
      }
    if (f_small && jud(*(a + be), val) == 1) be--;
    if (!f_small && jud(*(a + be), val) == -1) be++;
  } else {
    if (f_lb)
      while (be < en) {
        int mid = (be + en + 1) / 2;
        if (jud(*(a + mid), val) != -1)
          be = mid;
        else
          en = mid - 1;
      }
    else
      while (be < en) {
        int mid = (be + en) / 2;
        if (jud(*(a + mid), val) != 1)
          en = mid;
        else
          be = mid + 1;
      }
    if (!f_small && jud(*(a + be), val) == -1) be--;
    if (f_small && jud(*(a + be), val) == 1) be++;
  }
  return be;
}
template <class T>
inline T lowb(T num) {
  return num & (-num);
}
inline int bitnum(unsigned int nValue) { return __builtin_popcount(nValue); }
inline int bitnum(int nValue) { return __builtin_popcount(nValue); }
inline int bitnum(unsigned long long nValue) {
  return __builtin_popcount(nValue) + __builtin_popcount(nValue >> 32);
}
inline int bitnum(long long nValue) {
  return __builtin_popcount(nValue) + __builtin_popcount(nValue >> 32);
}
inline int bitmaxl(unsigned int a) {
  if (a == 0) return 0;
  return 32 - __builtin_clz(a);
}
inline int bitmaxl(int a) {
  if (a == 0) return 0;
  return 32 - __builtin_clz(a);
}
inline int bitmaxl(unsigned long long a) {
  int temp = a >> 32;
  if (temp) return 32 - __builtin_clz(temp) + 32;
  return bitmaxl(int(a));
}
inline int bitmaxl(long long a) {
  int temp = a >> 32;
  if (temp) return 32 - __builtin_clz(temp) + 32;
  return bitmaxl(int(a));
}
long long pow(long long n, long long m, long long mod = 0) {
  if (m < 0) return 0;
  long long ans = 1;
  long long k = n;
  while (m) {
    if (m & 1) {
      ans *= k;
      if (mod) ans %= mod;
    }
    k *= k;
    if (mod) k %= mod;
    m >>= 1;
  }
  return ans;
}
template <class t1, class t2>
inline void add(t1 &a, t2 b, int mod = -1) {
  if (mod == -1) mod = 1000000007;
  a += b;
  while (a >= mod) a -= mod;
  while (a < 0) a += mod;
}
template <class t>
void output1(t arr) {
  for (int i = 0; i < (int)arr.size(); i++) cerr << arr[i] << ' ';
  cerr << endl;
}
template <class t>
void output2(t arr) {
  for (int i = 0; i < (int)arr.size(); i++) output1(arr[i]);
}
const int maxn = 17;
int n;
int orig[maxn][3];
int dp[1 << maxn][140];
int have[1 << maxn][2];
int main() {
  ios_base::sync_with_stdio(0);
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    char str[2];
    scanf("%s%d%d", str, orig[i] + 1, orig[i] + 2);
    if (str[0] == 'B') orig[i][0] = 1;
  }
  memset(dp, -1, sizeof(dp));
  dp[0][0] = 0;
  for (int i = 0; i < 1 << n; i++) {
    for (int j = 0; j < n; j++)
      if (i & (1 << j)) have[i][orig[j][0]]++;
    pair<int, int> s = make_pair(0, 0), s1 = make_pair(0, 0);
    for (int j = 0; j < n; j++)
      if (!(i & (1 << j))) {
        s.first += bool(orig[j][1] >= have[i][0] + 1);
        s1.second += bool(orig[j][2] >= have[i][1] + 1);
      }
    for (int j = 0; j <= 120; j++)
      if (dp[i][j] != -1) {
        for (int k = 0; k < n; k++)
          if (!(i & (1 << k))) {
            if (orig[k][0] == 0) {
              pair<int, int> rs = s;
              rs.first -= bool(orig[k][1] >= have[i][0] + 1);
              int &upd = dp[i | (1 << k)][j + rs.first];
              upd = max(dp[i][j] + rs.second, upd);
            } else {
              pair<int, int> rs = s1;
              rs.second -= bool(orig[k][2] >= have[i][1] + 1);
              int &upd = dp[i | (1 << k)][j + rs.first];
              upd = max(dp[i][j] + rs.second, upd);
            }
          }
      }
  }
  pair<int, int> ans = make_pair(0, 0);
  int rans = 1000000007 * 2;
  for (int i = 0; i < n; i++) ans.first += orig[i][1], ans.second += orig[i][2];
  for (int i = 0; i <= 120; i++)
    if (dp[(1 << n) - 1][i] != -1) {
      rans = min(rans, max(ans.first - i, ans.second - dp[(1 << n) - 1][i]));
    }
  cout << rans + n << endl;
  return 0;
}