#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ul = unsigned long;
using ull = unsigned long long;

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int n;
	cin >> n;

	ll res{ 0 };
	if (n > 0)
	{
		for (int i = 0; i <= n / 5; ++i)
		{
			if (i * 5 == n)
			{
				++res;
				break;
			}

			for (int j = 0; j <= i; ++j)
			{
				int sum = i * 5 + j * 2;
				if (sum == n)
				{
					++res;
					break;
				}
				else if (sum > n)
					break;
				if ((n - sum) % 3 == 0)
					++res;
			}
		}
	}
	else
		res = 1;

	cout << res << "\n";

	return 0;
}