import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class No299 {
	public static void main(String[] args) {
		try{
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			long ver = Long.parseLong(br.readLine());
			System.out.println(pageNum(ver));
			
		}catch(IOException e){
			e.getStackTrace();
		}catch(NumberFormatException e){
			e.getStackTrace();
		}
	}
	
	public static long pageNum(long x){
		long page = 0;
		page = 316 + ( x -1 ) * 52;
		return page;
	}
}