# -*- coding: utf-8 -*-

t = {}
t['G'], t['C'], t['P'] = map(int, raw_input().split())
S, = map(str, raw_input().split())

score = 0

ts = ['G', 'C', 'P']

e = {'G': 0, 'C': 0, 'P': 0}

for s in S: e[s] += 1

for T in ts:
    # 勝てる数
    wt = 'G' if T == 'C' else 'C' if T == 'P' else 'P'
    wint = min(t[wt], e[T])
    score += 3 * wint
    t[wt] -= wint
    e[T] -= wint

for T in ts:
    # あいこにできる数
    draw = min(t[T], e[T])
    score += draw
    t[T] -= draw
    e[T] -= draw

# あとは負けなので無視

print score