import java.util.*;

public class Main {
    public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
        long ver1 = 316;
        long increasePage = 52;
        long n = Long.valueOf(scan.next());
        long page = ver1;
        if(n > 1){
        	page += increasePage * ( n - 1 );
        }
        System.out.println(page);
        

    }
}