function main(input) {
  const [a, v] = input[0].trim().split(" ").map(i => parseInt(i));
  const [b, w] = input[1].trim().split(" ").map(i => parseInt(i));
  const t = parseInt(input[2]);

  const result = ((v*t) >= ((w*t)+Math.abs(b-a)))
  console.log(result?"YES":"NO");
}
main(require('fs').readFileSync('/dev/stdin', 'utf8').trim().split("\n"));