public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int t = sc . nextInt ( ) ;
  int a = sc . nextInt ( ) ;
  double minSub = 1000.0 ;
  int ans = 0 ;
  for ( int i = 1 ;
  i <= n ;
  i ++ ) {
    int h = sc . nextInt ( ) ;
    double sub = Math . abs ( a - ( t - h * 0.006 ) ) ;
    if ( sub < minSub ) {
      minSub = sub ;
      ans = i ;
    }
  }
  System . out . println ( ans ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int t = sc . nextInt ( ) ; int a = sc . nextInt ( ) ; double minSub = 1000.0 ; int ans = 0 ; for ( int i = 1 ; i <= n ; i ++ ) { int h = sc . nextInt ( ) ; double sub = Math . abs ( a - ( t - h * 0.006 ) ) ; if ( sub < minSub ) { minSub = sub ; ans = i ; } } System . out . println ( ans ) ; sc . close ( ) ; }
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