#include <bits/stdc++.h>
#include <algorithm>

using namespace std;

int main()
{
    // taking input
    string str;
    cin >> str;
    int n = str.length(), b = 0, s = 0, c = 0, nb, ns, nc, pb, ps, pc;
    long long int r;
    for (int i = 0; i < n; i++)
    {
        if (str[i] == 'B')
            b++;
        if (str[i] == 'S')
            s++;
        if (str[i] == 'C')
            c++;
    }
    cin >> nb >> ns >> nc >> pb >> ps >> pc >> r;

    long long int middle, lower = 0, upper = r + nb + ns + nc;
    while (upper - lower > 1)
    {
        long long int t = r;
        middle = (upper + lower) / 2;
        if (middle * b > nb)
            t -= (middle * b - nb) * pb;
        if (middle * s > ns)
            t -= (middle * s - ns) * ps;
        if (middle * c > nc)
            t -= (middle * c - nc) * pc;
        if (t < 0)
            upper = middle;
        else
            lower = middle;
    }

    cout << lower;
    return 0;
}