static int calculateSum ( int n ) {
  int a1 = 1 , a2 = 2 ;
  int r = 2 ;
  int d = 1 ;
  return ( n ) * ( 2 * a1 + ( n - 1 ) * d ) / 2 + a2 * ( int ) ( Math . pow ( r , n ) - 1 ) / ( r - 1 ) ;
}

static int calculateSum ( int n ) { int a1 = 1 , a2 = 2 ; int r = 2 ; int d = 1 ; return ( n ) * ( 2 * a1 + ( n - 1 ) * d ) / 2 + a2 * ( int ) ( Math . pow ( r , n ) - 1 ) / ( r - 1 ) ; }
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