yuki = list(map(int,input().split())) #G C P
S = input()
l = len(S)
friend = [0] * 3

for i in range(l):#friend C P G
    if S[i] == "C":
        friend[0] += 1
    elif S[i] == "P":
        friend[1] += 1
    else:
        friend[2] += 1

point = 0

#勝ち
for i in range(3): #friend C P G
    if yuki[i] > friend[i]:
        point += friend[i] * 3
        yuki[i] -= friend[i]
        friend[i] = 0

    else:
        point += yuki[i] * 3
        friend[i] -= yuki[i]
        yuki[i] = 0

#あいこ
tmp = friend[:]

for i in range(3): #friend G C P
    friend[i] = tmp[i-1]

for i in range(3): #friend G C P
    if yuki[i] >= friend[i]:
        point += friend[i]

    else:
        point += yuki[i]

print(point)