import java.util.Scanner;

public class Test {

public static void main(String[] args) {

 Scanner input =  new Scanner(System.in);

 System.out.print("x = ");

 int x;

 x = input.nextInt();

 int y;

 y = 3 * (x*6) - 6 * (x*2) - 7;

 System.out.println("y = " + y);

}

}