# -*- coding:utf-8 -*-
import collections 

if __name__ == "__main__":
	jibun = map(int,raw_input().split())#g,c,p
	s = raw_input()
	aite = [0,0,0]
	aite[0] = s.count("C")
	aite[1] = s.count("P")
	aite[2] = s.count("G")
	ans = 0
	for i in xrange(3): #勝ち点取得
		temp = min(jibun[i],aite[i])
		ans += temp * 3
		jibun[i] -= temp
		aite[i] -= temp
	aite = aite[2:3] + aite[0:2]
	for i in xrange(3):
		temp = min(jibun[i],aite[i])
		ans += temp
	print ans