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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 	    Scanner sc=new Scanner(System.in);
  13. 	    int n=sc.nextInt();
  14. 	    int f=0;
  15. 	    int s=1;
  16. 	    int sum=f+s;
  17. 	    int i=3;
  18. 	    if(n==1){
  19. 	    	System.out.println("0");
  20. 	    }
  21. 	    if(n==2){
  22. 	    	System.out.println("1");
  23. 	    }
  24. 	    while(i<=n){
  25. 	    	sum+=i;
  26. 	    	f=s;
  27. 	    	s=sum;
  28. 	    	i++;
  29. 	    }
  30. 	    System.out.println(sum);
  31. 	    }
  32.  
  33. }
Success #stdin #stdout 0.18s 56600KB
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https://ideone.com/SD5ak8
language:
Java (HotSpot 12)
created:
11 days ago
visibility:
public

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