'use strict'

function main(input) {
  const [a, b, t] = input
    .trim()
    .split('\n')
    .map((x) => x.split(' ').map((v) => Number(v)))
  const maxA = a[1] * t[0]
  const maxB = b[1] * t[0]
  if (a[0] + maxA >= b[0] + maxB || a[0] - maxA <= b[0] - maxB) {
    console.log('YES')
    return
  }
  console.log('NO')
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'))
