Help me in solving SYNJ5V2 problem

My issue

what does ln mean?

My code

class CodeChef
{
	public static void main (String[] args)
	{
		System.out.println(3 + 4);
		System.out.print(2 + 1);
	}
}

Learning course: Learn Java
Problem Link: CodeChef: Practical coding for everyone

@narzesumar
println is used to print the answers in different lines.