import java.io.*;

class Process {
    private long N;

    Process(long N) {
        this.N = N;
    }

    private long numberOfPages(long n) {
        // 316 + 52(n - 1)
        return (316 + (52 * (n - 1)));
    }

    long getResult() {
        return numberOfPages(N);
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        var bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        var printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 入力
        long N = Long.parseLong(bufferedReader.readLine().trim());

        // 処理および出力
        printWriter.println((new Process(N)).getResult());

        bufferedReader.close();
        printWriter.close();
    }
}