public static void main ( String ag [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int i , j , k ;
  int N = sc . nextInt ( ) ;
  int M = sc . nextInt ( ) ;
  int type [ ] = new int [ N ] ;
  double location [ ] = new double [ N ] ;
  for ( i = 0 ;
  i < N ;
  i ++ ) {
    type [ i ] = sc . nextInt ( ) ;
    location [ i ] = sc . nextDouble ( ) ;
  }
  int dp [ ] = new int [ N ] ;
  Arrays . fill ( dp , 1 ) ;
  int max = 1 ;
  for ( i = 1 ;
  i < N ;
  i ++ ) {
    for ( j = 0 ;
    j < i ;
    j ++ ) {
      if ( dp [ j ] + 1 > dp [ i ] && type [ i ] >= type [ j ] ) {
        dp [ i ] = dp [ j ] + 1 ;
      }
    }
    max = Math . max ( max , dp [ i ] ) ;
  }
  System . out . println ( N - max ) ;
}

public static void main ( String ag [ ] ) { Scanner sc = new Scanner ( System . in ) ; int i , j , k ; int N = sc . nextInt ( ) ; int M = sc . nextInt ( ) ; int type [ ] = new int [ N ] ; double location [ ] = new double [ N ] ; for ( i = 0 ; i < N ; i ++ ) { type [ i ] = sc . nextInt ( ) ; location [ i ] = sc . nextDouble ( ) ; } int dp [ ] = new int [ N ] ; Arrays . fill ( dp , 1 ) ; int max = 1 ; for ( i = 1 ; i < N ; i ++ ) { for ( j = 0 ; j < i ; j ++ ) { if ( dp [ j ] + 1 > dp [ i ] && type [ i ] >= type [ j ] ) { dp [ i ] = dp [ j ] + 1 ; } } max = Math . max ( max , dp [ i ] ) ; } System . out . println ( N - max ) ; }
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