//package fact;

import java.util.Scanner;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintWriter;
 
class Main {
    public static void main(String[] args) throws IOException {

        Scanner in = new Scanner(new FileInputStream("fact.in"));
        PrintWriter out = new PrintWriter(new FileOutputStream("fact.out"));
        
        long a = in.nextInt();
        long rezultat = -1;
        
        out.print(rezultat);
        
        
        in.close();
        out.close();
    }
}