tets number_

import java.util.Scanner;

public class numbers {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int num = Integer.parseInt(scan.nextLine());

        if (num > 9 && num <= 99) {

            if (num % 2 == 0) {
                System.out.println(num + 7);
            } if (num % 10 == 5) {
                System.out.println(num + 10);
            }
            if (num % 2 == 0 ||num % 10 == 5 ){
                System.out.println(num+7+10);

            }
        } else {
            System.out.println("error");
        }
    }
}