G, C, P = map(int, input().split())
S = input()
g = S.count('G')
c = S.count('C')
p = S.count('P')
point = 0
point += 3 * (min(G, c) + min(C, p) + min(P, g))
G, c = G - min(G, c), c - min(G, c)
C, p = C - min(C, p), p - min(C, p)
P, g = P - min(P, g), g - min(P, g)
point += 1 * (min(G, g) + min(C, c) + min(P, p))
print(point)