def calc(a, b, i, j, p)
  cnt = [a[i], b[j]].min
  a[i] -= cnt
  b[j] -= cnt
  return p * cnt
end

G, C, P = gets.split.map(&:to_i)
S = gets

a = [G, C, P]
b = S.count("G"), S.count("C"), S.count("P")

point = 0
point += calc(a, b, 0, 1, 3)
point += calc(a, b, 1, 2, 3)
point += calc(a, b, 2, 0, 3)
point += calc(a, b, 0, 0, 1)
point += calc(a, b, 1, 1, 1)
point += calc(a, b, 2, 2, 1)
puts point