import java.io.{BufferedOutputStream, BufferedReader, InputStreamReader, PrintWriter}

object Main {
  def main(args: Array[String]): Unit = {
    val in = new BufferedReader(new InputStreamReader(System.in))
    val out = new PrintWriter(new BufferedOutputStream(System.out))
    val Array(a, b, c) = in.readLine().split("\\s+").map(i => BigInt(i.toInt))

    out.println(
      if (c - a - b <= 0) {
        "No"
      } else if (4 * a * b < (c - a - b) * (c - a - b)) {
        "Yes"
      } else {
        "No"
      }
    )
    out.flush()
  }
}
