#include <iostream>
#include <cmath>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <tuple>
#include <cstdint>
#include <cstdio>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <deque>
#include <unordered_map>
#include <unordered_set>
#include <bitset>
#include <cctype>
#include <climits>

#define rep(i, n) for(int i = 0; i < n; i++)
#define per(i, n) for(int i = n - 1; i >= 0; i--)
using ll = long long;
#define vi vector<int>
#define vvi vector<vi>
#define vl vector<ll>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define all(a) (a).begin(), (a).end()
#define rall(a) (a).rbegin(), (a).rend()
#define mod 1000000007
using namespace std;
int main(){
  int n;
  string s;
  cin >> n >> s;
  ll mn = 1e18, mx = -1e18;
  ll tot = 0, ans = -1e18;
  rep(i, n){
    int a; cin >> a;
    if(s[i] == 'R') tot += a;
    else tot -= a;
    if(i){
      ll res = max(abs(mn - tot), abs(mx - tot));
      ans = max({ans, res, abs(tot)});
    }
    mn = min(mn, tot);
    mx = max(mx, tot);
  }
  ll res = max(abs(mn - tot), abs(mx - tot));
  ans = max({ans, res, abs(tot)});
  cout << ans << "\n";
}