import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        if(n >= 2 && 3 / n != 0){
            System.out.println(3);
            
        }else{
            System.out.println(11);
        }
    
        
    }
}