let AV: [Int] = readLine()!.split(separator: " ").map { Int($0)! }
let BW: [Int] = readLine()!.split(separator: " ").map { Int($0)! }
let T: Int = Int(readLine()!)!

let distFirst: Int = abs(AV[0] - BW[0])
let dvw: Int = AV[1] - BW[1]
if dvw*T >= distFirst {
    print("YES")
} else {
    print("NO")
}