#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>
#include <numeric>
#include <fstream>
#include <string.h>
#include <stdlib.h>

using namespace std;

/*
	Find the sum of the first thirty golden nuggets.
*/

long long f(int l) {
	int i;
	long long a, r, x, y;

	//Init
	r = 0;
	a = 2; // First golden nugget
	x = -1;
	y = -1;

	for(i = 0; i < l / 2; i++) {
		// Add golden nugget to answer
		r += a;

		// Calculate next golden nugget
		a = (a + a) - x;

		// Add golden nugget to answer
		r += a;

		// Calculate next golden nugget
		a = (a * 4) - y;

		// Update
		x = (y - x) / 2;
		y = 14 + (19 * x) - (y + y);
	}

	return r;
}

int main() {
	cout << "Result = " << f(30) << endl;

	return 0;
}