class Yukicoder
  def initialize
    goo, choki, par = gets.chomp.split(' ').map(&:to_i)
    enemy = Hash.new(0)
    s = gets.chomp.split('')

    s.each do |i|
      enemy[i] += 1
    end

    score = 0

    goo_win   = [goo, enemy['C']].min
    choki_win = [choki, enemy['P']].min
    par_win   = [par, enemy['G']].min

    score += 3 * (goo_win + choki_win + par_win)
    goo   -= goo_win
    choki -= choki_win
    par   -= par_win
    enemy['C'] -= goo_win
    enemy['P'] -= choki_win
    enemy['G'] -= par_win

    goo_draw    = [goo, enemy['G']].min
    choki_draw  = [choki, enemy['C']].min
    par_draw    = [par, enemy['P']].min

    score += goo_draw + choki_draw + par_draw

    puts score
  end
end

Yukicoder.new