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

func main(){
    let abc = readInts()
    
    if 4*abc[0]*abc[1] < (abc[2]-abc[0]-abc[1]^2) && abc[0]+abc[1]<abc[2]{
        print("YES")
        return
    }
    print("NO")
}

main()
