public static void main ( String [ ] args ) {
  Scanner scanner = new Scanner ( System . in ) ;
  int n = scanner . nextInt ( ) ;
  int e_index = 0 ;
  int o_index = 0 ;
  int a ;
  int flag = - 1 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    a = scanner . nextInt ( ) ;
    if ( a % 2 == 0 ) if ( e_index == 0 ) e_index = i + 1 ;
    else flag = 1 ;
    if ( a % 2 == 1 ) if ( o_index == 0 ) o_index = i + 1 ;
    else flag = 0 ;
  }
  if ( flag == 1 ) System . out . println ( o_index ) ;
  else System . out . println ( e_index ) ;
}

public static void main ( String [ ] args ) { Scanner scanner = new Scanner ( System . in ) ; int n = scanner . nextInt ( ) ; int e_index = 0 ; int o_index = 0 ; int a ; int flag = - 1 ; for ( int i = 0 ; i < n ; i ++ ) { a = scanner . nextInt ( ) ; if ( a % 2 == 0 ) if ( e_index == 0 ) e_index = i + 1 ; else flag = 1 ; if ( a % 2 == 1 ) if ( o_index == 0 ) o_index = i + 1 ; else flag = 0 ; } if ( flag == 1 ) System . out . println ( o_index ) ; else System . out . println ( e_index ) ; }
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