public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int k = sc . nextInt ( ) ;
  int min = Integer . MAX_VALUE ;
  int max = Integer . MIN_VALUE ;
  int ans = - 1 ;
  if ( k == 1 ) {
    for ( int x = 0 ;
    x < n ;
    x ++ ) {
      int num = sc . nextInt ( ) ;
      if ( num < min ) {
        min = num ;
      }
    }
    ans = min ;
  }
  else if ( k >= 3 ) {
    for ( int x = 0 ;
    x < n ;
    x ++ ) {
      int num = sc . nextInt ( ) ;
      if ( num > max ) {
        max = num ;
      }
    }
    ans = max ;
  }
  else {
    int a = 0 ;
    int b = 0 ;
    for ( int x = 0 ;
    x < n ;
    x ++ ) {
      int num = sc . nextInt ( ) ;
      if ( x == 0 ) {
        a = num ;
      }
      else if ( x == n - 1 ) {
        b = num ;
      }
    }
    ans = Math . max ( a , b ) ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int k = sc . nextInt ( ) ; int min = Integer . MAX_VALUE ; int max = Integer . MIN_VALUE ; int ans = - 1 ; if ( k == 1 ) { for ( int x = 0 ; x < n ; x ++ ) { int num = sc . nextInt ( ) ; if ( num < min ) { min = num ; } } ans = min ; } else if ( k >= 3 ) { for ( int x = 0 ; x < n ; x ++ ) { int num = sc . nextInt ( ) ; if ( num > max ) { max = num ; } } ans = max ; } else { int a = 0 ; int b = 0 ; for ( int x = 0 ; x < n ; x ++ ) { int num = sc . nextInt ( ) ; if ( x == 0 ) { a = num ; } else if ( x == n - 1 ) { b = num ; } } ans = Math . max ( a , b ) ; } System . out . println ( ans ) ; }
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