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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. /* Name of the class has to be "Main" only if the class is public. */
  6. class Ideone
  7. {
  8. 	public static void main (String[] args) throws java.lang.Exception
  9. 	{	
  10. 		Scanner in = new Scanner(System.in);
  11. 		int k;
  12. 		double val = 0;
  13. 		k = in.nextInt();
  14. 		for (int n = 1; n <= k; n++){
  15. 			val += 1.0/((3*n - 2)*(3*n + 1)); 
  16. 		}
  17. 		System.out.println(val);
  18. 	}
  19. }
Success #stdin #stdout 0.13s 29544KB
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stdin
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100000
stdout
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0.3333117506971819
https://ideone.com/YWqID6
Циклы
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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