#include <bits/stdc++.h>
using namespace std;
using namespace chrono;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif

int main()
{
	int64_t n;
	string s;
	cin >> n >> s;
	vector<int64_t> as(n);
	for (auto &&a : as)
	{
		cin >> a;
	}

	vector<int64_t> r_sum(n + 1, 0), b_sum(n + 1, 0);
	for (int64_t i = 0; i < n; i++)
	{
		r_sum[i + 1] += r_sum[i];
		b_sum[i + 1] += b_sum[i];
		((s[i] == 'R') ? r_sum : b_sum)[i + 1] += as[i];
	}

	int64_t inf = (1LL << 60);

	int64_t ans = -inf;

	for (int64_t i = 0, d_min = 0, d_max = 0; i < n; i++)
	{
		ans = max({ans, abs(r_sum[i + 1] - b_sum[i + 1] - d_min), abs(r_sum[i + 1] - b_sum[i + 1] - d_max)});

		d_min = min(d_min, r_sum[i + 1] - b_sum[i + 1]);
		d_max = max(d_max, r_sum[i + 1] - b_sum[i + 1]);
	}

	cout << ans << endl;

	return 0;
}