Problem:
Score : 100 points

Problem Statement

Shichi-Go-San (literally "Seven-Five-Three") is a traditional event in a certain country to celebrate the growth of seven-, five- and three-year-old children.

Takahashi is now X years old. Will his growth be celebrated in Shichi-Go-San this time?

Constraints

1 ≤ X ≤ 9

X is an integer.

Input

Input is given from Standard Input in the following format:

X

Output

If Takahashi's growth will be celebrated, print YES; if it will not, print NO.

Sample Input 1

5

Sample Output 1

YES

The growth of a five-year-old child will be celebrated.

Sample Input 2

6

Sample Output 2

NO

See you next year.

Solution in Go (1.6) (judge verdict: Accepted)

package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)

func main() {
	sc.Split(bufio.ScanWords)
	x := readInt()
	if is753(x) {
		fmt.Println("YES")
	} else {
		fmt.Println("NO")
	}
}

func is753(x int) bool {
	switch {
	case x == 3:
		return true
	case x == 5:
		return true
	case x == 7:
		return true
	default:
		return false
	}
}

func read() string {
	sc.Scan()
	return sc.Text()
}

func readInt() int {
	i, e := strconv.Atoi(read())
	if e != nil {
		panic(e)
	}
	return i
}