use std::io::Read;

fn main() {
	let mut s = String::new();
	std::io::stdin().read_to_string(&mut s).ok();
	let n: Vec<usize> = s.split_whitespace().flat_map(str::parse).collect();
	let (mut a, mut d) = (0, vec![0; n[0]]);
	for i in n[2..].chunks(2) {
		for d in d[i[0] - 1..i[1]].iter_mut() {
			a -= *d;
			*d ^= 1;
			a += *d;
		}
		println!("{a}")
	}
}