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  1. #include <stdio.h>
  2.  
  3. int main() {
  4. 	long int n;
  5. 	scanf("%ld", &n);
  6. 	long long int total = 0;
  7. 	for(long int i = 1; i <= n; i++){
  8. 		total += (i + 1) * (i + 1) - i * i;
  9. 	}
  10. 	printf("%lld", total);
  11. 	return 0;
  12. }
Success #stdin #stdout 0s 5300KB
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https://ideone.com/jplGny
language:
C (gcc 8.3)
created:
37 days ago
visibility:
public

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