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  1. import java.util.*;
  2.  
  3. public class Main
  4. {
  5. 	public static void main (String[] args) throws java.lang.Exception
  6. 	{
  7. 		Scanner in = new Scanner(System.in);
  8. 		int n = in.nextInt();
  9.  
  10. 		if ((n < 3) || (n > 5)) System.out.println("Solution does not exist.");
  11. 		else
  12. 		{
  13. 			double s_2 = Math.sin(Math.PI / n);
  14. 			s_2 *= s_2;
  15. 			double r = Math.sqrt(1-1/(4.0*s_2));
  16. 			System.out.println(r);
  17. 		}
  18. 	}
  19. }
Success #stdin #stdout 0.12s 29552KB
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0.816496580927726
https://ideone.com/Ed1muZ
KM2
language:
Java (12.0.1)
created:
6 years ago
visibility:
secret

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