struct Point {
    pub time: i64,
    pub pos: i64,
}

impl Point {
    pub fn new(time: i64, pos: i64) -> Self {
        Point {
            time,
            pos
        }
    }
}

fn main() {
    // input N,M 
    let nm: Vec<i64> = {
        let mut s = String::new();
        std::io::stdin().read_line(&mut s).unwrap();
        s.split_whitespace().map(|x| x.parse().unwrap()).collect()
    };

    // input Vec(T[1..M],P[1..M])
    let mut v: Vec<Point> = Vec::new();
    for i in 0..nm[1] {
        let tp: Vec<i64> = {
            let mut s = String::new();
            std::io::stdin().read_line(&mut s).unwrap();
            s.split_whitespace().map(|x| x.parse().unwrap()).collect()
        };
        v.push(Point::new(tp[0], tp[1]));
    }

    // sort
    v.sort_by(|a,b| b.time.cmp(&a.time));
    v.reverse();

    // simulation
    let mut t = 0;
    let mut p = 0;
    for i in v.iter() {
        if i.time-t >= (i.pos-p).abs() {
            t = i.time;
            p = i.pos;
        }
        else {
            println!("No");
            return;
        }
    }
    println!("Yes");
}