import java.util.*;
 
public class Program {
 
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int startInt = scanner.nextInt();
 
        int sum = startInt;
        for(int i = 1; i <= 5; i++) {
            int nextNumber = startInt + i;
            sum += nextNumber % 13 == 0 ? -nextNumber : nextNumber;
        }
 
        System.out.println(sum);
    }
 
}