use proconio::input;

fn main() {
    input!{
        a:usize, b:usize, c:usize, d:usize,
        p:usize, q:usize, r:usize, s:usize, t:usize
    }

    let ans:&str = if ((a*p) + (b*q) + (c*r) + (d*s)) <= t {"Yes"} else {"No"};
    println!("{}", ans);
}