# -*- coding: utf-8 -*-
"""
No.161 制限ジャンケン
https://yukicoder.me/problems/no/161

"""
import sys
from sys import stdin
from collections import Counter
input = stdin.readline


def solve(yuki, s):
    G, C, P = 0, 1, 2
    friend = [0, 0, 0]
    for k, v in Counter(list(s)).most_common():
        if k == "G":
            i = G
        elif k == "C":
            i = C
        elif k == "P":
            i = P
        friend[i] = v

    ans = 0                     #  獲得できるポイントの合計
    # 勝ちによるポイントを計算
    g_win = min(yuki[G], friend[C])
    c_win = min(yuki[C], friend[P])
    p_win = min(yuki[P], friend[G])
    yuki[G] -= g_win
    yuki[C] -= c_win
    yuki[P] -= p_win
    friend[C] -= g_win
    friend[P] -= c_win
    friend[G] -= p_win
    ans += (g_win + c_win + p_win) * 3

    # 引き分けによるポイントを計算
    g_draw = min(yuki[G], friend[G])
    c_draw = min(yuki[C], friend[C])
    p_draw = min(yuki[P], friend[P])
    ans += (g_draw + c_draw + p_draw)

    return ans


def main(args):
    yuki = [int(x) for x in input().split()]
    s = input().strip()
    ans = solve(yuki, s)
    print(ans)


if __name__ == '__main__':
    main(sys.argv[1:])