#include<iostream>
#include<iomanip>
#include<math.h>
using namespace std;

bool isEven(int n)
{
	bool result = true;

	if(n%2 != 0)
	{
		result = false;
	}
	
	return result;
}

bool isOdd(int n)
{
	return !isEven(n);
}

int absoluteValue(int n)
{
	int result = n;

	if(n < 0)
	{
		result = result * -1;
	}

	return result;
}

bool isLeapYear(int year)
{
	bool result = false;

	if(year % 4 == 0)
	{
		if(year%100 == 0)
		{
			if(year%400 == 0)
			{
				result = true;
			}
		}
		else
		{
			result = true;
		}
	}

	return result;
}

bool isValidDate(int year, int month, int day)
{
	bool result = false;

	if(month >=1 && month <=12)
	{
		switch(month)
		{
			case 9: case 4:	case 6:	case 11:
				if(day >= 1 && day <= 30)
				{
					result = true;
				}
				break;
			case 2:
				if(isLeapYear(year) && day >= 1 && day <= 29)
				{
					result = true;
				}
				else if (day >= 1 && day <= 28)
				{
					result = true;
				}
				break;
			default:
				if(day >= 1 && day <= 31)
				{
					result = true;
				}
				break;
		}
	}


	return result;
}

void main()
{
	for(int i = 0; i < 100;i++)
	{
		if(isOdd(i))
		{
			cout << i << " is even " << endl;
		}
	}

	if(isValidDate(2000, 1, 32))
	{
		cout << "Yes" << endl;
	}

	int x;
	cin >> x;
	cout << absoluteValue(x) << endl;
	cout << abs(-99) << endl;
	cout << sin(3.14) << endl;

}