# import sys; input = sys.stdin.buffer.readline
# sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	G, C, P = getlist()
	D = defaultdict(int)
	S = input()
	for i in S:
		D[i] += 1

	ans = 0
	val = min(D["C"], G)
	ans += 3 * val
	D["C"] -= val; G -= val

	val = min(D["P"], C)
	ans += 3 * val
	D["P"] -= val; C -= val

	val = min(D["G"], P)
	ans += 3 * val
	D["G"] -= val; P -= val

	ans += min(D["G"], G)
	ans += min(D["P"], P)
	ans += min(D["C"], C)

	print(ans)

if __name__ == '__main__':
	main()