import java.util.Scanner;

class AriBook {
  public static void main(String[] args) {
    Scanner stdIn = new Scanner(System.in);

    long n = stdIn.nextLong();
    long pages = 316;

    for ( long i = 1; i < n; i++ ) {
      pages += 52;
    }
    System.out.println(pages);
  }
}