class Calc0113
  EPS = 1e-2

  def initialize(args)
    args = args.map { |l| l.chomp.split(/\s+/) }
    @s = args.shift.first
  end

  def run
    x = @s.count('N') - @s.count('S')
    y = @s.count('E') - @s.count('W')
    Math.sqrt(x ** 2 + y ** 2)
  end
end

puts Calc0113.new(STDIN.readlines).run if __FILE__ == $0