#include <bits/stdc++.h>

using namespace std;

#define REP(i,n) for(int i(0); i <  (n); ++i)

#define LL       long long

char str[1010];

LL len;

LL b, c, s, nb, nc, ns, pb, pc, ps;

LL money;

bool judge(LL x){

    LL mb = x * b;

    LL ms = x * s;

    LL mc = x * c;

    LL now_money = money;

    if (mb > nb) now_money -= (mb - nb) * pb;

    if (ms > ns) now_money -= (ms - ns) * ps;

    if (mc > nc) now_money -= (mc - nc) * pc;

    return now_money >= 0LL;

}

int main(){

    scanf("%s", str);

    len = strlen(str);

    REP(i, len){

        if (str[i] == 'B') ++b;

        else if (str[i] == 'S') ++s;

        else ++c;

    }

    cin >> nb >> ns >> nc;

    cin >> pb >> ps >> pc;

    cin >> money;

    LL l = 0, r = 1e14;

    while (l + 1 < r){

        LL mid = (l + r) / 2;

        if (judge(mid)) l = mid; else r = mid - 1;

    }

    if (judge(r)) cout << r << endl; else cout << l << endl;

    return 0;

}