static int sum ( int x , int y , int n ) {
  int sum1 = ( int ) ( ( Math . pow ( x , 2 ) * ( Math . pow ( x , 2 * n ) - 1 ) ) / ( Math . pow ( x , 2 ) - 1 ) ) ;
  int sum2 = ( int ) ( ( x * y * ( Math . pow ( x , n ) * Math . pow ( y , n ) - 1 ) ) / ( x * y - 1 ) ) ;
  return sum1 + sum2 ;
}

static int sum ( int x , int y , int n ) { int sum1 = ( int ) ( ( Math . pow ( x , 2 ) * ( Math . pow ( x , 2 * n ) - 1 ) ) / ( Math . pow ( x , 2 ) - 1 ) ) ; int sum2 = ( int ) ( ( x * y * ( Math . pow ( x , n ) * Math . pow ( y , n ) - 1 ) ) / ( x * y - 1 ) ) ; return sum1 + sum2 ; }
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