#include <bits/stdc++.h>

using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)

int main() {
    int n;
    std::cin >> n;
    std::string s;
    std::cin >> s;
    std::vector<int> a(n);

    rep(i, n) { std::cin >> a[i]; }

    ll sum = 0;
    ll ans = 0;
    ll min = 0, max = 0;

    rep(i, n) {
        if (s[i] == 'R') {
            sum += a[i];
        } else {
            sum -= a[i];
        }

        ans = std::max({ans, std::abs(sum - min), std::abs(sum - max)});
        min = std::min(min, sum);
        max = std::max(max, sum);
    }

    std::cout << ans << std::endl;
}