import java.io.*;

public class Pentagon{
  public static void main(String args[]) throws IOException {

   double x,y,t;
   
   int division_num =5;

    File file = new File("pentagon.txt");
    PrintWriter out = new PrintWriter(file);

    for(int i=0; i<5; i++){
    	
        t = 2*Math.PI/division_num*i;
        x = Math.cos(t);
        y = Math.sin(t);
        out.println( x + ", " + y);
    }
    
    t = 0;
    x = Math.cos(t);
    y = Math.sin(t);
    out.println( x + ", " + y);
    out.close();
 }
}