#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int N;
	string S;
	cin >> N >> S;
	vector<int> A(N);
	REP(i, N) {
		scanf("%d", &A[i]);
		if (S[i] == 'B') A[i] = -A[i];
	}
	
	ll ans = 0, mx = 0, mn = 0, sum = 0;
	REP(i, N) {
		chmax(ans, abs(sum - mx));
		chmax(ans, abs(sum - mn));
		sum += A[i];
		chmax(mx, sum);
		chmin(mn, sum);
	}
	chmax(ans, abs(sum));
	cout << ans << endl;
}