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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int n,i=0,a=2,sum=0;
  5. 	scanf("%d",&n);
  6.  
  7. 	while(i<n){
  8. 		i=i+1;
  9. 		sum=sum+a;
  10. 		a=a+3;
  11.  
  12. 	}
  13. 	printf("%d",sum);
  14.  
  15. 	return 0;
  16. }
  17.  
Success #stdin #stdout 0s 5320KB
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https://ideone.com/I5IlKM
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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