public class Mathe {
	public int fak(int piN){
		int iValue = 0; // wrong
//		int iValue = 1; // OK
		int iCnt = 0;
		while (iCnt++ < piN){
			iValue = iValue*iCnt;
		}
		return iValue;
	}

	public double MWSt(double pdAmount){
		return pdAmount*0.16;
	}
	
	public boolean isOdd(int piN){
		return (piN%2 == 1);
	}
}