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#include <iostream>

int main()
{
	int givenSumNumber, n = 0;
	std::cin >> givenSumNumber;

	for (int a = 0x0; a <= givenSumNumber; a++)
	{
		for (int b = 0x0; b <= givenSumNumber; b++)
		{
			if (a+b == givenSumNumber)
				n++;
		}
	}
	std::cout << n << "\n";

	return 0;
}