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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5.  
  6. int main() {
  7.  
  8. 	int n, a=1, b=1, c, suma=0;
  9. 	cin >> n;
  10.  
  11. 	if (n==1) suma=1;
  12. 	if (n==2) suma=2;
  13.  
  14. 	if (n>=3)
  15. 	{
  16. 		suma=2;
  17. 		for(int i=3; i<=n; i++)
  18. 		{
  19. 			c=a+b;
  20. 			suma+=c;
  21. 			a=b;
  22. 			b=c;
  23.  
  24. 		}
  25.  
  26. 	}
  27.  
  28. 	cout << suma << endl;
  29.  
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 5304KB
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888
stdout
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-1929778448
https://ideone.com/vbgBCm
language:
C++ (gcc 8.3)
created:
8 hours ago
visibility:
public

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