use proconio::input;

fn main() {
    input! {
        n: i64, s: i64, b: i64,
        h: [i64; n]
    }

    let (mut stamina, mut height) = (s, h[0]);

    for w in h.windows(2) {
        let (current, next) = (w[0], w[1]);
        let s0 = ((next - height).max(0) + b - 1) / b;
        let s1 = ((next - current).max(0) + b - 1) / b;
        if s0 > stamina && s1 > s {
            println!("No");
            return;
        }
        (stamina, height) = if stamina - s0 > s - s1 {
            (stamina - s0, height + s0 * b)
        } else {
            (s - s1, current + s1 * b)
        };
    }

    println!("Yes");
}