gi, ci, pi = map(int, input().split())
s = list(input())
s.sort()
res = 0
for c in s:
    if c == "C":
        if gi > 0:
            gi -= 1
            res += 3
        elif ci > 0:
            ci -= 1
            res += 1
    if c == "G":
        if pi > 0:
            pi -= 1
            res += 3
        elif gi > 0:
            gi -= 1
            res += 1
    if c == "P":
        if ci > 0:
            ci -= 1
            res += 3
        elif pi > 0:
            pi -= 1
            res += 1
print(res)