let a, v = Scanf.sscanf (read_line()) "%d %d" (fun a v -> a,v)
let b, w = Scanf.sscanf (read_line()) "%d %d" (fun b w -> b,w)
let t = read_int()
let diff = abs @@ a - b
let _ = (if diff + (w * t) - (v * t) <= 0 then "YES" else "NO") |> print_endline