#! /usr/bin/env ruby

if ARGV.length != 1
        abort("Incorrect arguments - needs input file")
elsif not File.exist? (ARGV[0])
	abort("File #{ARGV[0]} did not exist")
end

file = ARGV[0]

time, distance = File.open(file, "r").each_line(chomp: true).map {|v| v.split(":")[1].split(" ").join("").to_i}
events = [[time, distance]]

product = events.map do |event|
	mid = (event[0].to_f / 2).floor
	first_success = (1..mid).bsearch {|i| (event[0] - i) * i > event[1]}
	num_success = (mid - first_success + 1) * 2
	event[0].odd? ? num_success : num_success - 1
end.reduce(:*)

puts product