extension String: CollectionType {} 

let a: [Int] = readLine()!.split(" ").map { Int($0)! }
let b: Double = Double(a[0])
let c: Double = Double(a[1])
let d: Double = Double(a[2])
if (sqrt(b)+sqrt(c) < sqrt(d) ) {
  print("Yes")
} else{
  print("No")
}