const Main = input => {
  const input2 = input.split('\n');
  const Asinfo = input2[0].split(' ');
  const Bsinfo = input2[1].split(' ');
  let diff;
  const asspeed = Matn.abs((Number(Asinfo[1])))
  const bsspeed = Matn.abs((Number(Bsinfo[1])));
  if(Math.sign(asspeed) - Number(bsspeed) == 1){
      diff = Number(asspeed) - Number(bsspeed)
  } else{
      diff = Number(bsspeed) - Number(asspeed)
  }
  const fardiff = (Number(Bsinfo[0]) - Number(Asinfo[0]));
  if(Math.sign(Number(diff)) != 1) return console.log('NO');
  const sec = fardiff / Number(diff);
  if(sec >= Number(input2[2])){
    return console.log('NO');
  }
  console.log('YES')
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));