func main()
	var n: int :: cui@inputInt()
	var red: dict<int, int> :: #dict<int, int>
	var blue: dict<int, int> :: #dict<int, int>
	
	var ans: int :: 0
	
	for(1, n)
		var a: int :: cui@inputInt()
		var b: int :: cui@inputInt()
		var t: int :: cui@inputInt()
		var pos: int :: b - t
		if(a = 0)
			do red.add(pos, red.get(pos, &) + 1)
			do ans :+ blue.get(pos, &)
		else
			do blue.add(pos, blue.get(pos, &) + 1)
			do ans :+ red.get(pos, &)
		end if
	end for
	
	do cui@print("\{ans}\n")
end func