#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;
//using mint = modint1000000007;
//using mint = modint998244353;



int main(){
  int N;
  cin >> N;
  string S;
  cin >> S;
  vector<ll> v1,v2;
  rep(i,N){
    ll a;
    cin >> a;
    if(S[i] == 'R'){
      v1.push_back(a);
      v2.push_back(-a);
    }else{
      v1.push_back(-a);
      v2.push_back(a);      
    }
  }

  ll ret = -1e18;
  {
    ll mx = v1[0];
    ret = max(ret, mx);
    REP(i,1,N){
      mx = max(v1[i], mx+v1[i]);
      ret = max(ret, mx);
    }
  }
  {
    ll mx = v2[0];
    ret = max(ret, mx);
    REP(i,1,N){
      mx = max(v2[i], mx+v2[i]);
      ret = max(ret, mx);
    }
  }

  cout << ret << endl;
  
  return 0;
}