package collaboration;

import java.util.Scanner;
import java.math.*;

public class Calculator {
    public static void main(String[] args) 
    {
        Scanner sc=new Scanner(System.in);
        double result=1.0;
        String Command=sc.nextLine();
        String parameters=sc.nextLine();
        if(Command.equals("0"))
            result=Calculator.Log(parameters);
//        else if(Command.equals("1"))
//            result=Calculator.ex(parameters);
//        else if(Command.equals("2"))
//            result=Calculator.jjcc(parameters);
          else if(Command.equals("6"))
        	  result=Calculator.sin(parameters);
          else if(Command.equals("7"))
        	  result=Calculator.cos(parameters);
          else if(Command.equals("8"))
        	  result=Calculator.tan(parameters);
        System.out.println(result);
        
    }
    public static double Log(String s)
    {
        String[] parameters=new String[2];
        parameters=s.split(" ");
        float a=Float.parseFloat(parameters[0]);
        float b=Float.parseFloat(parameters[1]);
        double result=Math.log(b)/Math.log(a);  
        return result;
    }
    public static double sin(String s)
    {
       double x=Double.parseDouble(s);
       return Math.sin(Math.toRadians(x));//Math.toRadians()将角度转换为弧度	   
    }
    public static double cos(String s)
    {
    	double x=Double.parseDouble(s); 
        return Math.cos(Math.toRadians(x));
    }
    public static double tan(String s)
    {
    	double x=Double.parseDouble(s); 
    	return Math.tan(Math.toRadians(x));
    }
    
//    public static double jjcc()
//    {
//        
//    }
//    public static double ex()
//    {
//        
//    }
}