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

local hm = {}
for line in io.lines(arg[3]) do
	local row = {}
	for c in chars(line) do
		table.insert(row, tonumber(c))
	end
	table.insert(hm, row)
end

local function get(r, c)
	return (hm[r] or {})[c] or 9
end

local union = {}
for r, row in pairs(hm) do
	for c, col in pairs(row) do
		if col ~= 9 then
			if get(r - 1, c) ~= 9 then
				if union[r] == nil then union[r] = {} end
				union[r][c] = { r - 1, c }
			end
			if get(r, c - 1) ~= 9 then
				if union[r] == nil then union[r] = {} end
				if union[r][c] ~= nil then
					local r0, c0 = r, c - 1
					while type(union[r0][c0]) == "table" do
						r0, c0 = unpack(union[r0][c0])
						if union[r0] == nil then union[r0] = {} end
					end
					local r1, c1 = r, c
					while type(union[r1][c1]) == "table" do
						r1, c1 = unpack(union[r1][c1])
						if union[r1] == nil then union[r1] = {} end
					end
					if r0 ~= r1 or c0 ~= c1 then
						union[r1][c1] = { r0, c0 }
					end
				else
					union[r][c] = { r, c - 1 }
				end
			end
		end
	end
end

local sums = {}
for r, row in pairs(hm) do
	for c, col in pairs(row) do
		if col ~= 9 then
			local r0, c0 = r, c
			while type(union[r0][c0]) == "table" do
				r0, c0 = unpack(union[r0][c0])
			end
			if sums[r0] == nil then sums[r0] = {} end
			sums[r0][c0] = (sums[r0][c0] or 0) + 1
		end
	end
end

local sizes = {}
for r, row in pairs(sums) do
	for c, col in pairs(row) do
		table.insert(sizes, col)
	end
end

table.sort(sizes)
print(sizes[#sizes] * sizes[#sizes - 1] * sizes[#sizes - 2])