yuki = gets.chomp.split(' ').map {|i| i.to_i}
s = gets.chomp
opponent = [s.scan('G').length, s.scan('C').length, s.scan('P').length]
#p yuki
#p s
#p opponent
opponent.push(opponent.shift)
point = 0
(0...3).each do |i|
	if yuki[i] >= opponent[i]
		point += 3 * opponent[i]
		yuki[i] -= opponent[i]
		opponent[i] = 0
	else
		point += 3 * yuki[i]
		opponent[i] -= yuki[i]
		yuki[i] = 0
	end
end
#puts point
opponent.unshift(opponent.pop)
#p yuki
#p opponent
(0...3).each do |i|
	if opponent[i] >= yuki[i]
		point += yuki[i]
	else
		point += opponent[i]
	end
end
puts point