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  1. //#3
  2. #include <stdio.h>
  3.  
  4. int main(void) {
  5. 	int a=1,b,z=2,c=2;
  6. 	scanf("%d\n",&b);
  7. 	while(a<b){
  8. 		c=c*3;
  9. 		a=a+1;
  10. 		z=z+c;
  11. 	}
  12. 	printf("%d\n",z);
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5312KB
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https://ideone.com/tkKqw2
language:
C99 (gcc 8.3)
created:
10 days ago
visibility:
public

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