#!/usr/bin/env luajit
require("utils")

local xmin, xmax, ymin, ymax = string.match(io.open(arg[3]):read("*a"), "target area: x=(.*)%.%.(.*), y=(.*)%.%.(.*)")
xmin, xmax, ymin, ymax = tonumber(xmin), tonumber(xmax), tonumber(ymin), tonumber(ymax)

local maxdy = 0

if ymax > 0 then
	maxdy = ymax
end

if ymin < 0 then
	if -ymin - 1 > maxdy then
		maxdy = -ymin - 1
	end
end

print(euler(maxdy))