import scala.io.StdIn._
import java.util.Scanner

object Main {
  def main(args: Array[String]) = {
    val s = new Scanner(System.in)
    val a = s.nextLong
    val b = s.nextLong
    val c = s.nextLong
    if (c - a - b > 0 && 4 * a * b < (c - a - b) * (c - a - b)) {
      println("Yes")
    } else {
      println("No")
    }
  }
}