import java.io.IOException;
  
                

public class GetPeach { 

/**
  
                  

 * 
  
                  

 * @param args
  
                  

 */ 

public static void main(String[] args) throws IOException{ 

 System.out.println("the total number of the peach is:"+getNumPeach(10));
  
                  

} 

/**

* get the total number of the peach

* @param params

*/
private static int getNumPeach(int params) {


if(params < 1) {


throw new RuntimeException("params must more than zero!");

} else if (params == 1) {


return 1;

} else {


return (getNumPeach(params - 1) +1)*2;

}
 

}


}