G, C, P = map(int, input().split())
S = input()

eg = S.count("G")
ec = S.count("C")
ep = S.count("P")

x, y, z = min(G, ec), min(C, ep), min(P, eg)
point = (x + y + z) * 3
        
G -= x
ec -= x
C -= y
ep -= y
P -= z
eg -= z

point += min(G, eg) + min(C, ec) + min(P, ep)

print(point)