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

ans = 0
ans = (min(G,c) + min(P,g) + min(C,p)) * 3
G, c = G - min(G,c), c - min(G,c)
P, g = P - min(P,g), g - min(P,g)
C, p = C - min(C,p), p - min(C,p)
ans += min(G,g) + min(P,p) + min(C,c)

print(ans)