function Main(input) {
input = input.split("\n");
aa　= input[0].split(" ");
bb　= input[1].split(" ");
cc　= input[2];

var a = parseInt(aa[0], 10);
var v = parseInt(aa[1], 10);
var b = parseInt(bb[0], 10);
var w = parseInt(bb[1], 10);
var t = parseInt(cc[0], 10);

 var oni =v > w && (Math.abs( a - b )) / ( v - w ) <= t 

 if  (oni == true) {
  console.log('YES');
 } else {
  console.log('NO');
 }
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));//おまじない



