import java.util.*

fun main(args: Array<String>) {
    val pw = java.io.PrintWriter(System.out)
    Problem.solve(Scanner(System.`in`), pw)
    pw.flush()
}

object Problem {
    fun solve(sc: Scanner, pw: java.io.PrintWriter) {
        val A = sc.next().toLong()
        val V = sc.next().toLong()
        val B = sc.next().toLong()
        val W = sc.next().toLong()
        val T = sc.next().toLong()
        if (A <= B && A + V * T >= B + W * T) {
            pw.println("YES")
        } else if (A > B && A - V * T <= B - W * T) {
            pw.println("YES")
        } else {
            pw.println("NO")
        }
    }
}
