gistfile1.rb

lines = $stdin.read.lines.map &:strip

lines = $stdin.read.lines.map do |line|
  line.strip
end

while true
  c,n = lines.shift.split.map &:to_i
  break if c == 0 && n == 0
  v = lines.shift.split.map(&:to_i)
  v.shift
  v.pop
  if v == []
    v = [0]
  end
  puts c * ( n - 1 ) * 2 + v.reduce(&:+)
end