static int powerDigitSum ( int a , int n ) {
  int res = 1 ;
  while ( n > 0 ) {
    if ( n % 2 == 1 ) {
      res = res * digSum ( a ) ;
      res = digSum ( res ) ;
    }
    a = digSum ( digSum ( a ) * digSum ( a ) ) ;
    n /= 2 ;
  }
  return res ;
}

static int powerDigitSum ( int a , int n ) { int res = 1 ; while ( n > 0 ) { if ( n % 2 == 1 ) { res = res * digSum ( a ) ; res = digSum ( res ) ; } a = digSum ( digSum ( a ) * digSum ( a ) ) ; n /= 2 ; } return res ; }
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