def calc(win,draw,lose,res):
    if win > 0:
        win -= 1
        res += 3
    elif draw > 0:
        draw -= 1
        res += 1
    else:
        lose -= 1
    return [win,draw,lose,res]

G,C,P = [int(x) for x in input().split(" ")]
S = input()

res = 0
for x in S:
    if x == 'G':
        
        P,G,C,res = calc(P,G,C,res)
    elif x == 'C':
        G,C,P,res = calc(G,C,P,res)
    else:
        C,P,G,res = calc(C,P,G,res)

print(res)