((stdin) => {
	let [a, v, b, w, t] = stdin.split(/\s/);
	let speed = +w - +v;
	let distance = +b - +a;
	if (+t * speed - distance > 0) {
		console.log('NO');
	}
	else {
		console.log('YES');
	}
})(require("fs").readFileSync("/dev/stdin", "UTF-8"));