#[allow(unused_imports)]
use std::cmp;
use std::fs::File;
use std::io::Read;
#[allow(unused_imports)]
use std::mem;

#[allow(dead_code)]
fn pow_speedy_with_mod(mut p: i64, mut q: i64, m: i64) -> i64 {
    p %= m;
    let mut r = p;
    let mut ret: i64 = 1;
    while q > 0 {
        ret *= if q % 2 == 1 { r } else { 1 };
        r *= r;
        r %= m;
        q /= 2;
        ret %= m;
    }
    return ret;
}

#[allow(dead_code)]
fn comb(n: usize, k: usize, m: i64, frac: &[i64], frac_inv: &[i64]) -> i64 {
    let mut ret = 1i64;
    if n < k {
        return 0;
    }
    ret *= frac[n] * frac_inv[n - k];
    ret %= m;
    ret *= frac_inv[k];
    ret %= m;
    ret
}

#[derive(Debug)]
struct Piece {
    mark: char,
    y: i32,
    x: i32,
}

fn main() {
    let inputstatus = 1;

    let mut buf = String::new();
    let filename = "inputrust.txt";

    if inputstatus == 0 {
        let mut f = File::open(filename).expect("file not found");
        f.read_to_string(&mut buf)
            .expect("something went wrong reading the file");
    } else {
        std::io::stdin().read_to_string(&mut buf).unwrap();
    }

    let mut iter = buf.split_whitespace();

    let _: usize = iter.next().unwrap().parse().unwrap();
    let m: usize = iter.next().unwrap().parse().unwrap();
    let mut ans = true;

    let mut t = 0i64;
    let mut x = 0i64;

    for _ in 0..m {
        let ti: i64 = iter.next().unwrap().parse().unwrap();
        let xi: i64 = iter.next().unwrap().parse().unwrap();
        if (ti - t) < (x - xi).abs() {
            ans = false;
            break;
        }
        t = ti;
        x = xi;
    }

    let ans = if ans { "Yes" } else { "No" };
    println!("{}", ans);

    // let n = iter.next().unwrap().parse().unwrap();

    // println!("{}", n);
    // println!("{:?}", cum_num);
}