public static boolean isDivisible ( String S ) {
  int n = S . length ( ) ;
  if ( S . charAt ( n - 1 ) != '5' && S . charAt ( n - 1 ) != '0' ) return false ;
  int sum = 0 ;
  for ( int i = 0 ;
  i < S . length ( ) ;
  i ++ ) sum += ( int ) S . charAt ( i ) ;
  if ( sum % 3 == 0 ) return true ;
  else return false ;
}

public static boolean isDivisible ( String S ) { int n = S . length ( ) ; if ( S . charAt ( n - 1 ) != '5' && S . charAt ( n - 1 ) != '0' ) return false ; int sum = 0 ; for ( int i = 0 ; i < S . length ( ) ; i ++ ) sum += ( int ) S . charAt ( i ) ; if ( sum % 3 == 0 ) return true ; else return false ; }
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