#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <string>

using namespace std;
typedef long long lint;
#define MIN(a,b) ((a)<(b)?(a):(b))
#define SWAP(a,b) (a ^= b,b = a ^ b,a ^= b)

int main()
{
	lint N;
	cin >> N;
	cout << (N - 1) * 52 + 316 << endl;

	return 0;
}