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  1. #include <stdio.h>
  2.  
  3. int a(int n)
  4. {
  5. 	int an=0,i;
  6. 	for(i=0;i<n;i++)
  7. 	{
  8. 		an=2*an+3;
  9. 	}
  10. 	return an;
  11. }
  12.  
  13. int main(void) {
  14.  
  15. 	int n;
  16. 	scanf("%d",&n);
  17. 	printf("%d",a(n));
  18.  
  19. 	return 0;
  20. }
  21.  
Success #stdin #stdout 0.01s 5300KB
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stdout
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https://ideone.com/pwOwVB
language:
C (gcc 8.3)
created:
8 days ago
visibility:
public

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