robots = DATA.read.scan(/-?\d+/).map(&:to_i).each_slice(4).to_a

MAX_X = 101
MAX_Y = 103
# MAX_X = 11
# MAX_Y = 7

QUADRANTS = [
  [(0...MAX_X/2), (0...MAX_Y/2)],
  [(MAX_X/2+1..), (0...MAX_Y/2)],
  [(0...MAX_X/2), (MAX_Y/2+1..)],
  [(MAX_X/2+1..), (MAX_Y/2+1..)],
]

robots_s = -> {
  (0..MAX_Y).map {|y|
    (0..MAX_X).map {|x|
      robots.any? {|r_x,r_y,_,_| r_x == x && r_y == y } ? ?# : ?.
    }.join
  }.join("\n")
}

(0..).each do |i|
  robots.each do |robot|
    p_x, p_y, v_x, v_y = robot
    robot[0] = (p_x + v_x) % MAX_X
    robot[1] = (p_y + v_y) % MAX_Y
  end

  if (i - 46) % 103 == 0
    puts i
    puts robots_s[]
  end
end

pp [
  [(0...MAX_X/2), (0...MAX_Y/2)],
  [(MAX_X/2+1..), (0...MAX_Y/2)],
  [(0...MAX_X/2), (MAX_Y/2+1..)],
  [(MAX_X/2+1..), (MAX_Y/2+1..)],
].map {|xx,yy| robots.count {|x,y,_,_| xx.cover?(x) && yy.cover?(y) }}
  .inject(&:*)

__END__
p=0,4 v=3,-3
p=6,3 v=-1,-3
p=10,3 v=-1,2
p=2,0 v=2,-1
p=0,0 v=1,3
p=3,0 v=-2,-2
p=7,6 v=-1,-3
p=3,0 v=-1,-2
p=9,3 v=2,3
p=7,3 v=-1,2
p=2,4 v=2,-3
p=9,5 v=-3,-3