#include <bits/stdc++.h>

#define rep(i, a, b) for(int i = (a); i <= (b); i ++)
using std::cin, std::cout, std::cerr;
using ll = long long;

int main() {
    std::ios::sync_with_stdio(false);
    int n; cin >> n;
    std::string s; cin >> s;
    std::vector<int> a(n);
    rep(i, 0, n - 1) cin >> a[i];

    ll sum = 0, min = 0, max = 0;
    ll ans = 0;
    rep(i, 0, n - 1) {
        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);
    }
    cout << ans << '\n';
}