public static void main ( String args [ ] ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  int H = sc . nextInt ( ) ;
  int a [ ] = new int [ N ] ;
  int b [ ] = new int [ N ] ;
  int max = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    a [ i ] = sc . nextInt ( ) ;
    b [ i ] = sc . nextInt ( ) ;
    max = Math . max ( a [ i ] , max ) ;
  }
  Arrays . sort ( b ) ;
  int ans = 0 ;
  int sum = 0 ;
  for ( int i = N - 1 ;
  i >= 0 ;
  i -- ) {
    if ( max > b [ i ] ) {
      break ;
    }
    sum += b [ i ] ;
    ans ++ ;
    if ( sum >= H ) {
      System . out . println ( ans ) ;
      return ;
    }
  }
  while ( sum < H ) {
    sum += max ;
    ans ++ ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String args [ ] ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; int H = sc . nextInt ( ) ; int a [ ] = new int [ N ] ; int b [ ] = new int [ N ] ; int max = 0 ; for ( int i = 0 ; i < N ; i ++ ) { a [ i ] = sc . nextInt ( ) ; b [ i ] = sc . nextInt ( ) ; max = Math . max ( a [ i ] , max ) ; } Arrays . sort ( b ) ; int ans = 0 ; int sum = 0 ; for ( int i = N - 1 ; i >= 0 ; i -- ) { if ( max > b [ i ] ) { break ; } sum += b [ i ] ; ans ++ ; if ( sum >= H ) { System . out . println ( ans ) ; return ; } } while ( sum < H ) { sum += max ; ans ++ ; } System . out . println ( ans ) ; }
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