public class Main {
public static void main(String[] args) {
System.out.println(Math.log(6));
System.out.println(Math.log(Math.E));
System.out.println(Math.log(2));
System.out.println(Math.log(1));
System.out.println(Math.log(0));
System.out.println(Math.log(-1));
}
}