fn main() {
    let (h,w) : (usize, usize) = input_t();
    let mut a = Vec::new();

    for _ in 0..h { a.push(input_vec::<usize>()) };

    let mut dp = vec![vec![vec![None; 2]; w]; h];
    dp[0][0][0] = Some(a[0][0]);
    dp[0][0][1] = Some(a[0][0]);

    for i in 0..h { for j in 0..w {
        for k in 0..2 {
            if let Some(d) = dp[i][j][k] {
                if i+1 < h {
                    if a[i+1][j] < d {
                        chmax(&mut dp[i+1][j][k], Some(d + a[i+1][j]));
                    } else if k == 0 && !(i+2==h && j+1==w) {
                        chmax(&mut dp[i+1][j][k+1], Some(d));
                    }
                }
                if j+1 < w {
                    if a[i][j+1] < d {
                        chmax(&mut dp[i][j+1][k], Some(d + a[i][j+1]));
                    } else if k == 0 && !(i+1==h && j+2==w) {
                        chmax(&mut dp[i][j+1][k+1], Some(d));
                    }
                }
            }
        }
    }}

    let ans = dp[h-1][w-1].iter().any(|d| d.is_some());
    println!("{}", if ans {"Yes"} else {"No"});
}

fn chmax<T>(x:&mut T, y:T) -> bool where T : std::cmp::PartialOrd { if *x < y { *x = y; true } else { false } }
fn chmin<T>(x:&mut T, y:T) -> bool where T : std::cmp::PartialOrd { if *x > y { *x = y; true } else { false } }
#[allow(dead_code)] fn input<T: std::str::FromStr>() -> T { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); s.trim().parse().ok().unwrap() } #[allow(dead_code)] fn input_t<T: std::str::FromStr, U: std::str::FromStr>() -> (T, U) { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); let s = s.trim().split_whitespace().collect::<Vec<&str>>(); (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap()) } #[allow(dead_code)] fn input_t3<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr>() -> (T1, T2, T3) { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); let s = s.trim().split_whitespace().collect::<Vec<&str>>(); (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap()) } #[allow(dead_code)] fn input_t4<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr, T4: std::str::FromStr>() -> (T1, T2, T3, T4) { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); let s = s.trim().split_whitespace().collect::<Vec<&str>>(); (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap(), s[3].parse().ok().unwrap()) } #[allow(dead_code)] fn input_t5<T1: std::str::FromStr, T2: std::str::FromStr, T3: std::str::FromStr, T4: std::str::FromStr, T5: std::str::FromStr>() -> (T1, T2, T3, T4, T5) { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); let s = s.trim().split_whitespace().collect::<Vec<&str>>(); (s[0].parse().ok().unwrap(), s[1].parse().ok().unwrap(), s[2].parse().ok().unwrap(), s[3].parse().ok().unwrap(), s[4].parse().ok().unwrap()) } #[allow(dead_code)] fn input_vec<T: std::str::FromStr>() -> Vec<T> { let mut s = String::new(); std::io::stdin().read_line(&mut s).ok(); s.trim().split_whitespace().map(|s| s.parse().ok().unwrap()).collect() }