/* 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
	{
		Optional<Integer> a = Optional.of(1);
		Optional<Integer> b = a.stream()
			.filter(aa -> aa == 2)
			.map(aa -> Optional.of(2))
			.findFirst()
			.orElseGet(() -> Optional.of(3));
 
		System.out.println(b.get());
	}
}

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