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