#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;

int main() {
	int N;
	cin >> N;

	int cnt = 0;
	for (int i = 0; i <= N; i++) {
		for (int j = 0; j <= N; j++) {
			int sum = i + j;
			int dif = N - sum;
			if (dif >= 0 && dif <= N) cnt++;
		}
	}

	cout << cnt << endl;
}