import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
//入力文字をの読み取り
    	Scanner sc = new Scanner(System.in);
        //1文字目
        long n = sc.nextLong();
        //計算
        
        long result = 316+((n-1)*52);
        //出力
        	System.out.println(result);
    }
}