import java.math.BigDecimal
import java.math.RoundingMode

fun main(args: Array<String>) {
    val (a, b, c) = readLine()!!.split(" ").map(String::toDouble)
    val decA = BigDecimal(a)
    val decB = BigDecimal(b)
    val decC = BigDecimal(c)
    val decD = decC.subtract(decA).subtract(decB)
    val dec4 = BigDecimal(4)
    if (decD > BigDecimal.ZERO && decD.multiply(decD) > decA.multiply(decB).multiply(dec4)) {
        println("Yes")
    } else {
        println("No")
    }
}