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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		Scanner in = new Scanner(System.in);
  10. 		long x1,x2,x3;
  11. 		long x4=0;
  12. 		long n=in.nextLong();
  13. 		x1=2;
  14. 		x2=4;
  15. 		x3=7;
  16. 		for (int i=3; i<n; i++) {
  17. 			x4=x1+x2+x3;
  18. 			x1=x2;
  19. 			x2=x3;
  20. 			x3=x4;    
  21. 		}
  22. 		if (n==1) 
  23. 			System.out.println(2); 
  24. 		else if (n==2) 
  25. 			System.out.println(4); 
  26. 		else if (n==3)
  27. 			System.out.println(7); 
  28. 		else 
  29. 			System.out.println(x4);
  30. 	}
  31. }
Success #stdin #stdout 0.09s 29496KB
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https://ideone.com/SuK4zG
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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