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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int n;
  5. 	int i=2;
  6. 	int s=0;
  7. 	int sum=1;
  8.  
  9. 	scanf("%d",&n);
  10. 	while(sum<=n){
  11. 		s=s+i;
  12. 		sum=sum+1;
  13. 		i=i*3;
  14.  
  15. 	}
  16. 	printf("%d\n",s);
  17. 	return 0;
  18. }
  19.  
Success #stdin #stdout 0s 5272KB
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https://ideone.com/SgTPet
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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