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

x, y, z = map(min, [G,C,P], [c,p,g])

G, C, P = G-x, C-y, P-z
g, c, p = g-z, c-x, p-y

a, b, c = map(min, [G,C,P], [g,c,p])

print((x+y+z)*3 + (a+b+c))