import java.util.Scanner;
/**
* Created by DMyrzaka on 28.02.2017.
*/
public class Zadacha1_1_middle {
public static void main(String args[])
{
double L,i,y;
Scanner sc = new Scanner(System.in);
System.out.print("Введите i->");
i=sc.nextDouble();
System.out.print("Введите y->");
y=sc.nextDouble();
// cos2y=1-2*(sin y)(sin y)
L=(0.81*Math.cos(i))/(Math.log(y)+2*Math.pow(i,3));
System.out.println("L = "+L);
}
}
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