#include <iostream>
using namespace std;
typedef long long ll;

int main()
{
    int n;
    string s;
    cin >> n >> s;
    ll a[200005];
    for(int i = 0; i < n; i++) cin >> a[i];
    ll r = 0, b = 0, ans = 0;
    for(int i = 0; i < n; i++){
        if(s[i] == 'R'){
            r = max(0ll, r + a[i]);
            b = max(0ll, b - a[i]);
        }
        else{
            r = max(0ll, r - a[i]);
            b = max(0ll, b + a[i]);
        }
        ans = max(ans, max(r, b));
    }
    cout << ans << endl;
}