import java.io.PrintWriter
import kotlin.math.abs

fun main() {
    PrintWriter(System.out).use { out ->
        solve(out)
        out.flush()
    }
}

fun solve(out: PrintWriter) {
    val (a, v) = readLongList()
    val (b, w) = readLongList()
    val t = readLong()

    if (w >= v) {
        println("NO")
    } else {
        val d = abs(a - b)
        if (d <= t * (v - w)) {
            println("YES")
        } else {
            println("NO")
        }
    }
}

fun readInteger() = readLine()!!.toInt()
fun readLong() = readLine()!!.toLong()
fun readStringList() = readLine()!!.split(" ")
fun readIntegerList() = readStringList().map(String::toInt)
fun readLongList() = readStringList().map(String::toLong)
fun readDoubleList() = readStringList().map(String::toDouble)
