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May 23rd, 2018
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  1. #include <iostream>
  2. using namespace std;
  3.  
  4.  
  5. float licz(int n){
  6.  
  7. if(n==1) return -3;
  8. return 3*licz(n-1)+1;
  9.  
  10. }
  11.  
  12. main(){
  13.  
  14. int n;
  15. cin>>n;
  16. cout<<licz(n);
  17.  
  18. return 0;
  19. }
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