#include <fstream>
ifstream cin("date.in");
ofstream cout("date.out");

using namespace std;
int main()
{
	int n, s;
		cin >> n;
		for (int i = 0; i < n / 2; i++)
			for (int z = 2; z < i / 2; z++) if (i % z != 0) s++;
		cout << s;

}

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