import java.util.*;

public class Test12 {
  public static void main(String[] args) throws Exception {
    // Your code here!
    Scanner sc=new Scanner(System.in);
    String[] line;
    String result="";
    line=sc.nextLine().split(" ");
    result+=316+52*(Long.parseLong(line[0])-1);
    sc.close();
    System.out.println(result);
  }
}