#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;


int solve(string &S, vector<int> a, char c){
	int N = S.size();
	int maxi = -INF, b = -INF;
	
	for(int i = 0; i < N; i++){
		if(c == S[i]) {
			a[i] *= -1;
		}
	}
	
	for(int i = 0; i < N; i++){
		b = max(a[i], b + a[i]);
		maxi = max(maxi, b);
		// cout<<a[i]<<" "<<maxi<<" "<<b<<endl;
	}
	// cout<<endl;
	
	return maxi;
}
signed main(){
	cout<<fixed<<setprecision(10);
	
	int N;
	string S;
	vector<int> a;
	
	cin>>N;
	
	cin>>S;
	
	a.resize(N);
	
	for(int i = 0; i < N; i++){
		cin>>a[i];
	}
	
	cout<<max(solve(S, a, 'R'),solve(S, a, 'B'))<<endl;
	
	return 0;
}