#!/usr/bin/env python
# -*- coding: utf-8 -*-

hand_num = list(map(int,input().split()))

S = sorted(input())
friend = [S.count('G'),S.count('C'),S.count('P')]
point = 0

#win
for i in range(3):
    if hand_num[i] > friend[(i+1)%3]:
        point += friend[(i+1)%3] * 3

        hand_num[i] -= friend[(i+1)%3]
        friend[(i+1)%3] = 0
    else:
        point += hand_num[i] * 3

        friend[(i+1)%3] -= hand_num[i]
        hand_num[i] = 0

#draw
for i in range(3):
    if hand_num[i] > friend[i]:
        point += friend[i]

        hand_num[i] -= friend[i]
        friend[i] = 0
    else:
        point += hand_num[i]

        friend[i] -= hand_num[i]
        hand_num[i] = 0

print(point)