#!/usr/bin/python
from collections import Counter

def doit(op_hand, my_hand, point):
    if not op_hands[op_hand]:
        return 0
    tmp = min(op_hands[op_hand], my_hands[my_hand])
    res = tmp * point
    op_hands[op_hand] -= tmp
    my_hands[my_hand] -= tmp
    return res

s = 'GCP'
arr = map(int, raw_input().split())
my_hands = {k: v for k, v in zip(s, arr)}
op_hands = Counter(raw_input())
res = 0
for k, v in my_hands.items():
    weak_op = s[s.find(k) - 2]
    res += doit(weak_op, k, 3)
for k, v in my_hands.items():
    res += doit(k, k, 1)
print res