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 r0 = ((next - height).max(0) + b - 1) / b;
        let r1 = ((next - current).max(0) + b - 1) / b;

        let s0 = stamina - r0;
        let s1 = s - r1;
        if s0 < 0 && s1 < 0 {
            println!("No");
            return;
        }

        let h0 = height + r0 * b;
        let h1 = current + r1 * b;

        (stamina, height) = if s0 >= 0 && s1 < 0 {
            (s0, h0)
        } else if s0 < 0 {
            (s1, h1)
        } else {
            if h0 + s0 * b > h1 + s1 * b {
                (s0, h0)
            } else {
                (s1, h1)
            }
        };
    }

    println!("Yes");
}