object Main extends App {
  val in = scala.io.Source.stdin.getLines.toSeq
  val ls = in.map(_.split(' ').map(_.toLong))
  val A = ls(0)(0).toLong
  val B = ls(0)(1).toLong
  val C = ls(0)(2).toLong
  
  //A + B + 2sqrt(AB) < C
  //val left = Math.sqrt(A.toLong * B) * 2
  //val right = C.toLong - A - B
  val left = A*B * 2 - C*C
  val right = A*(A - C*2) + B*(B - C*2)
  //println(left)
  //println(right)
  val ret = left < right 
  println(if(ret) "Yes" else "No")
}
