'use strict'

function main(input) {
  const [a, b, t] = input
    .trim()
    .split('\n')
    .map((x) => x.split(' ').map((v) => Number(v)))

  const distance = Math.abs(a[0] - b[0])
  const distance2 = (a[1] - b[1]) * t[0]

  console.log(distance <= distance2 ? 'YES' : 'NO')
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'))