Problem Statement 
 You and your friend are at a shooting gallery, and your friend wants to make a bet that he can hit the target within a certain number of shots. You know that each time he takes a shot, there is an accuracy percent probability that he will hit the target. Return the maximal number of shots at which it is advantageous for you to take the bet. A number n is considered advantageous if the probability that your friend will hit the target in n or less shots is less than 50%. 

Definition 
 Class:  ShootingGallery  Method:  profitableBet  Parameters:  int  Returns:  int  Method signature:  int profitableBet(int accuracy)  (be sure your method is public) 




Notes 
  All shots are independent. 
  Hint: Try to calculate the probability that your friend will NOT hit the target in n or less shots. 

Constraints 
  accuracy will be between 1 and 100, inclusive. 

Examples 
0)  
  Returns: 1  In this case, he will hit the target in one shot with probability 0.4, and in two or less shots with probability 0.74. 


1)  
  Returns: 3  In one shot  0.2.
In two or less shots  0.36.
In three or less shots  0.488.
In four or less shots  0.5904. 


2)  
 
3)  
 