#pragma GCC optimize ("O2")
#pragma GCC target ("avx2")
#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;

using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please


int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int N, A[200000];
	cin >> N;
	string T;
	cin >> T;
	rep(i, N) cin >> A[i];

	rep(i, N) if (T[i] == 'R') {
		A[i] = -A[i];
	}

	ll S[200001] = {};
	rep(i, N) S[i + 1] = S[i] + A[i];

	ll saidai = -1e18, saishou = 1e18;
	rep(i, N + 1) {
		chmax(saidai, S[i]);
		chmin(saishou, S[i]);
	}

	co(saidai - saishou);

	Would you please return 0;
}