#pragma GCC diagnostic warning "-Wextra"
#pragma GCC diagnostic warning "-Wshadow"
#include <bits/stdc++.h>
using namespace std;

template <class A, class B> bool cmin(A& a, B b) { return a > b && (a = b, true); }
template <class A, class B> bool cmax(A& a, B b) { return a < b && (a = b, true); }
template <class A, class B> ostream& operator<<(ostream& os, pair<A, B>& p) { return os << '(' << p.first << ", " << p.second << ')'; }
static bool debug = false;
void dump() {}
template <class A, class... B> void dump(A&& a, B&&... b) { if (debug) cout << a << (sizeof...(b) ? ' ' : '\n'), dump(b...); }
template <class A> void dump1D(A& a) { if (debug) for (auto i = a.begin(); i != a.end(); i++) cout << *i << (next(i) != a.end() ? ' ' : '\n'); }
template <class A> void dump2D(A& a) { if (debug) for (auto i = a.begin(); i != a.end(); i++) dump1D(*i), cout << (next(i) != a.end() ? "" : "\n"); }

signed main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  // debug = true;

  long N;
  string S;
  cin >> N >> S;
  vector<long> A(N);
  for (long i = 0; i < N; i++) cin >> A.at(i);

  vector<long> R(N), B(N);
  for (long i = 0; i < N; i++) {
    if (S.at(i) == 'R') R.at(i) = A.at(i);
    else B.at(i) = A.at(i);
  }
  dump1D(R);
  dump1D(B);

  auto cs = [](auto vec) {
    vector<long> ret((long)vec.size() + 1);
    partial_sum(vec.begin(), vec.end(), ret.begin() + 1);
    return ret;
  };
  R = cs(R);
  B = cs(B);
  dump1D(R);
  dump1D(B);

  for (long i = 0; i < N + 1; i++) {
    R.at(i) -= B.at(i);
  }
  dump1D(R);
  cout << *max_element(R.begin(), R.end()) - *min_element(R.begin(), R.end()) << '\n';
}