/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner scanIn = new Scanner(System.in);
		double a, b, P, Q;
 
		a = scanIn.nextDouble();
		b = scanIn.nextDouble();
 
		P = (a + b) / 2;
		Q = Math.sqrt(a * b);
 
		System.out.println("(a + b) / 2 = " + P + "!");
		System.out.println("Math.sqrt(a * b) = " + Q + "!");
	}
}

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NAo2

4
6