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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int a,b,c=2,d=1;
  5. 	scanf("%d\n",&b);
  6.  
  7. 	while(d<b){
  8. 		d=d+1;
  9. 		c=3*c;
  10. 		a=a+c;
  11. 	}
  12.  
  13. 	printf("%d\n",a);
  14.  
  15. 	return 0;
  16. }
  17.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
4
stdout 
78
https://ideone.com/wTv7E8
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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