#include<iostream>
#include<string>
int main()
{
	int i;
	std::string s;
	std::cin >> i;

	for (int j = 1; j <= i; j++)
	{
		if (j % 3 == 0)
		{
			s += "zz";
			//std::cout << "Fizz";
		}
		if (j % 5 == 0)
		{
			s += "zz";
			//std::cout << "Buzz";
		}
	}
	int count = 0;
	for (const char c : s)
	{
		if (c == 'z')
		{
			count++;
		}
	}
	std::cout << count <<  std::endl;
	return 0;
}