N, Q = gets.split(" ").map{|s| s.to_i}

lamp = Array.new(N, false)
cnt = 0

ans = []
Q.times {
	l, r = gets.split(" ").map{|s| s.to_i}
	(l-1).upto(r-1) {|i|
		if lamp[i] then
			cnt -= 1
		else
			cnt += 1
		end
		lamp[i] = !lamp[i]
	}
	ans << cnt
}

puts ans