func main()
	var n: int :: cui@inputInt()
	var q: int :: cui@inputInt()
	var ans: int :: 0
	var v: []bool :: #[n]bool
	for(1, q)
		var l: int :: cui@inputInt() - 1
		var r: int :: cui@inputInt() - 1
		for i(l, r)
			do ans :+ v[i] ?(-1, 1)
			do v[i] :: !v[i]
		end for
		do cui@print("\{ans}\n")
	end for
end func