#!/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 mindy = ymin

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

local mindx = 0
while euler(mindx) < xmin do mindx = mindx + 1 end

local maxdx = xmax

local count = 0
for odx = mindx, maxdx do
	for ody = mindy, maxdy do
		local x, y, dx, dy = 0, 0, odx, ody
		while x <= xmax and y >= math.min(0, ymin) do
			x, y = x + dx, y + dy
			if xmin <= x and x <= xmax and ymin <= y and y <= ymax then
				count = count + 1
				break
			end
			if dx > 0 then dx = dx - 1 end
			dy = dy - 1
		end
	end
end

print(count)