import java.util.*;

    public class P {

        public static void main(String[] args) {

            Scanner in = new Scanner(System.in);
            String x = in.next();

            int b = 0;
            int s = 0;
            int c = 0;
            for (int i = 0; i < x.length(); i++) {

                if (x.charAt(i) == 'B') {
                    b++;
                } else if (x.charAt(i) == 'S') {
                    s++;
                } else {
                    c++;
                }

            }

            int nb = in.nextInt();
            int ns = in.nextInt();
            int nc = in.nextInt();
            int pb = in.nextInt();
            int ps = in.nextInt();
            int pc = in.nextInt();
            long r = in.nextLong();

            long left = 0;
            long right = r + 1;
            long mid = 0;
            long ans = 0;
            while (left <= right) {

                mid = (left + right) / 2;


                long first = Math.max(0, b*mid-nb) * pb;
                long second = Math.max(0, s*mid-ns) * ps;
                long last = Math.max(0, c*mid-nc) * pc;
                long p = first + second + last;

                if (p == r) {
                    System.out.println(mid);
                    return;
                }
                if (p > r) {
                    right = mid - 1;
                } else {
                    left = mid + 1;
                    ans = mid;
                }

            }

            System.out.println(ans);

        }


    }