#include <bits/stdc++.h>
using namespace std;

int main() {
	int n; cin >> n;
	string s; cin >> s;
	vector<long long> a(n);
	for (int i = 0; i < n; i++) cin >> a[i];
	vector<long long> r(n+1), b(n+1);
	r[0] = b[0] = 0;
	for (int i = 1; i <= n; i++) {
		r[i] = r[i-1]; b[i] = b[i-1];
		if (s[i-1] == 'R') r[i] += a[i-1];
		else b[i] += a[i-1];
	}
	long long maxans = 0, minans = 0;
	long long curmin = 0, curmax = 0;
	for (int i = 1; i <= n; i++) {
		maxans = max(maxans, r[i]-b[i] - curmin);
		minans = min(minans, r[i]-b[i] - curmax);
		curmax = max(curmax, r[i]-b[i]);
		curmin = min(curmin, r[i]-b[i]);
	} 
	cout << max(maxans, -minans) << endl;
}