Function main

codes/cpp/Code_5_04_1.cpp:6–22

using namespace std;

int main() {
	// ����
	int N, K;
	cin >> N >> K;

	// ���� B �̌� yojishou �𐔂��� �� �����̏o��
	long long yojishou = 0;
	for (int a = 1; a <= N; a++) {
		for (int b = max(1, a - (K - 1)); b <= min(N, a + (K - 1)); b++) {
			for (int c = max(1, a - (K - 1)); c <= min(N, a + (K - 1)); c++) {
				if (abs(b - c) <= K - 1) yojishou += 1;
			}
		}
	}
	cout << (long long)N * N * N - yojishou << endl;
	return 0;
}