object Main extends App {
	val Array(a, b, c) = scala.io.StdIn.readLine.split(" ").map(_.toLong)
	val tp1 = scala.math.sqrt(a) + scala.math.sqrt(b)
	val tp2 = scala.math.sqrt(c)

	if(tp1 < tp2 ) println("Yes")
	else println("No")
}