func readInts() -> [Int]{
    readLine()!.split(separator: " ").map { Int($0)! }
}

func main(){
    let abc = readInts()
    let(a,b,c) = (abc[0],abc[1],abc[2])
    let x = c-a-b
    
    if c-a-b<=0 {
        print("NO")
        return
    }
    if 4*a*b<x*x {
        print("YES")
        return
    }
    print("NO")
    
    
    
}

main()

