import cs1.Keyboard;

public class Test3 // a possible solution for the third question
{
    static final double HELLOVALUE = 300.0;
 
    public static void main(String args[])
        {
	
	// First read the three numbers.
	double number1 = Keyboard.readDouble();
	double number2 = Keyboard.readDouble();
	double number3 = Keyboard.readDouble();

	// Make sure that the values are positive
	if (number1 < 0)	number1 = -number1;
	if (number2 < 0)	number2 = -number2;
	if (number3 < 0)	number3 = -number3;

	// Calculate the average	
	double average = (number1 + number2 + number3) / 3.0;
	
	// print the average out or hello
	if (average > HELLOVALUE)
		System.out.println("Hello");
	else
		System.out.println(average);
	
	//print "no average" if all the numbers were 0
	if (number1==0.0 && number2==0.0 && number3==0.0)
		System.out.println("zero average");
	
}       }