#include "bits/stdc++.h"
using namespace std;

long long nb,ns,nc,pb,ps,pc,credit;
long long rb = 0,rs = 0,rc = 0;

bool yes (long long k) {
	long long needb = k * rb;
	long long needs = k * rs;
	long long needc = k * rc;
	needb -= nb;
	needs -= ns;
	needc -= nc;
	needb = max(needb,0LL);
	needs = max(needs,0LL);
	needc = max(needc,0LL);
	long long money = needb * pb + needc * pc + needs * ps;
	if (money <= credit) return true;
	else return false;
}

int main () {
	 ios::sync_with_stdio(false);
	 cin.tie(nullptr);
	 cout.tie(nullptr);
	 string s;
	 cin >> s;
	 for (int i = 0;i < (int) s.size(); ++i) {
		 if (s[i] == 'B') {
			 rb++;
		 }
		 if (s[i] == 'C') {
			 rc++;
		 }
		 if (s[i] == 'S') {
			 rs++;
		 }
	 }
	 cin >> nb >> ns >> nc >> pb >> ps >> pc >> credit;
	 long long l = 0,r = 1e13;
	 long long res = 0;
	 while (l <= r) {
		 long long mid = l + (r - l) / 2;
		 if (yes(mid)) {
			 l = mid + 1;
			 res = mid;
		 } else {
			 r = mid - 1;
		 }
	 }
	 cout << res << '\n';
}

//Problem Link : https://codeforces.com/problemset/problem/371/C