#include <fstream>

using namespace std;

ifstream f("forcoding.in");
ofstream g("forcoding.out");

int n,i,j;
int v[10001];
int st[10001], dr[10001];
int s[10001], maxim;

int main()
{
    f>>n;
    for (i=1;i<=n;i++)
        f>>v[i];
    for (i=1;i<=n;i++)
        f>>st[i];
    for (i=1;i<=n;i++)
        f>>dr[i];

    s[1]=v[1];
    for (i=2;i<=n;i++)
    {
        maxim=0;
        for (j=i-st[i]-1;j>=1;j--)
            if (j+dr[j]<i && s[j]>maxim)
                maxim=s[j];
        s[i]=v[i]+maxim;
    }

    maxim=0;
    for (i=1;i<=n;i++)
        if (s[i]>maxim)
            maxim=s[i];

    g<<maxim;

    return 0;
}