import Foundation

let inputOni = readLine()!.components(separatedBy: " ").map{ Int($0)}
let inputNige = readLine()!.components(separatedBy: " ").map{ Int($0)}
let T = Int(readLine()!)!

let A = inputOni[0]!
let V = inputOni[1]!
let B = inputNige[0]!
let W = inputNige[1]!
let dis = abs(A - B)
let disPerSec = (V - W) * T

if dis <= disPerSec {
    print("YES")
}else {
    print("NO")
}