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#include <iostream>
#include <vector>
using namespace std;

vector<int> V;
long long sum = 0;
int n, m;

void f(char tab[])
{
    for(int i = 0, j = 0; ; i++, j++)
    {
        if(i == n)
            i = 0;
        if(j == m)
            j = 0;

        if(tab[j] == 'W')
        {
            ++V[i];
            ++sum;
        }
        else
        {
            --V[i];
            ++sum;
            if(V[i] == 0)
                break;
        }
    }
}

int main()
{
    cin >> n;

    for(int i = 0; i < n; i++)
    {
        int a;
        cin >> a;
        V.push_back(a);
    }

    char *tab = new char[n];
    cin >> m;
    cin >> tab;

    f(tab);
    cout << sum << endl;
    
    delete [] tab;

    return 0;
}