require 'bigdecimal' require 'bigdecimal/util' class Yukicoder def initialize n = gets.to_i @total = BigDecimal.new("0") n.times do val = BigDecimal.new(gets) @total += val end end def run str = @total.to_s("F") str =~ /^\d+\.(\d+)$/ below_zero_count = 10 - Regexp.last_match(1).size below_zero_count.times { str << '0' } return str end end puts Yukicoder.new.run