using System;
using System.Collections.Generic;

class Program
{
    static string InputPattern = "InputX";
 
    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();
 
        if (InputPattern == "Input1") {
            WillReturn.Add("1");
            //316
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("2");
            //368
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("987654321");
            //51358024956
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }
 
    static void Main()
    {
        List<string> InputList = GetInputList();
        long N = long.Parse(InputList[0]);

        //初項316 公差52の等差数列の一般項
        Console.WriteLine(316 + 52 * (N - 1));
    }
}