#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
typedef pair<ll,ll> P;
typedef modint998244353 mint;
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define rrep(i,a,b) for(ll i=a;i>=b;i--)
const ll inf=1e18;
ll n;
string s;
ll a[200005],r[200005],b[200005],c[200005];
int main(void){
    cin.tie(0);
    ios::sync_with_stdio(0);
    cin>>n>>s;
    rep(i,0,n){
        cin>>a[i];
        if(s[i]=='R'){
            r[i+1]=r[i]+a[i];
            b[i+1]=b[i];
        }else{
            b[i+1]=b[i]+a[i];
            r[i+1]=r[i];
        }
        c[i+1]=(r[i+1]-b[i+1]);
    }
    sort(c,c+n+1);
    cout<<abs(c[n]-c[0])<<endl;
    
}