package main
 
import (
    "bufio"
    "fmt"
    "os"
 
)
 
func main() {
    reader := bufio.NewReader(os.Stdin)
    var n int
    fmt.Fscan(reader , &n)
    if n%2==1{
        fmt.Println("YES")
    }else{
        fmt.Println("NO")
    }
 
}