def win(te)
  case te
  when "G" then "P"
  when "C" then "G"
  when "P" then "C"
  end
end


tes = %w[G C P]
limits = [tes, gets.split(" ").map(&:to_i)].
  transpose.reduce({}){|h, (k,v)| h[k]=v; h}


sum = 0
gets.chomp.chars.each do |aite|
  me = win(aite)
  case
  when limits[me] > 0
    sum += 3
    limits[me] -= 1
  when limits[aite] > 0
    sum += 1
    limits[aite] -= 1
  else
    limits[(tes - [me, aite]).first] -= 1
  end
end

p sum