G, C, P = map(int, input().split(" "))
S = input()
g = S.count("G")
c = S.count("C")
p = S.count("P")

win = 0
if G == c and C == p and P == g:
    win = (G+C+P)*3
else:
    if G >= c:
        win += c
        G -= c
        c = 0
    else:
        win += G
        c -= G
        G = 0
    if P >= g:
        win += g
        P -= g
        g = 0
    else:
        win += P
        g -= P
        P = 0
    if C >= p:
        win += p
        C -= p
        p = 0
    else:
        win += C
        p -= C
        C = 0
    win *= 3

    if G >= g:
        win += g
        G -= g
        g = 0
    else:
        win += G
        g -= G
        G = 0
    if P >= p:
        win += p
        P -= p
        p = 0
    else:
        win += P
        p -= P
        P = 0
    if C >= c:
        win += c
        C -= c
        c = 0
    else:
        win += C
        c -= C
        C = 0

print(win)