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

public class No00000299_Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		System.out.println(BigDecimal.valueOf(316 + 52 * (Double.parseDouble(br.readLine()) - 1)));
	}
}