use proconio::input;
use proconio::fastout;

#[fastout]
#[allow(non_snake_case)]
fn main() {
    input! {
        (N, S, B): (usize, usize, usize),
        H: [usize; N],
    }
    assert!(1 <= N && N <= 200_000);
    assert!(1 <= S && S <= 1_000);
    assert!(1 <= B && B <= 1_000_000_000);
    assert!(H.iter().all(|&x| x <= 1_000_000_000));
    let mut rev = H[0];
    for i in 1..N {
        if rev >= H[i] {
            continue;
        }
        let sub = H[i] - rev;
        if (sub + B - 1) / B > S {
            println!("No");
            return;
        }
        rev = H[i];
    }
    println!("Yes");
}