public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int m = sc . nextInt ( ) ;
  ArrayList < DJSet > ds = new ArrayList < DJSet > ( ) ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) ds . add ( new DJSet ( n ) ) ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    int a = sc . nextInt ( ) - 1 ;
    int b = sc . nextInt ( ) - 1 ;
    for ( int j = 0 ;
    j < m ;
    j ++ ) {
      if ( i != j ) ds . get ( j ) . union ( a , b ) ;
    }
  }
  int ans = 0 ;
  for ( int i = 0 ;
  i < m ;
  i ++ ) {
    if ( ds . get ( i ) . countSet ( ) != 1 ) ans ++ ;
  }
  System . out . println ( ans ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int m = sc . nextInt ( ) ; ArrayList < DJSet > ds = new ArrayList < DJSet > ( ) ; for ( int i = 0 ; i < m ; i ++ ) ds . add ( new DJSet ( n ) ) ; for ( int i = 0 ; i < m ; i ++ ) { int a = sc . nextInt ( ) - 1 ; int b = sc . nextInt ( ) - 1 ; for ( int j = 0 ; j < m ; j ++ ) { if ( i != j ) ds . get ( j ) . union ( a , b ) ; } } int ans = 0 ; for ( int i = 0 ; i < m ; i ++ ) { if ( ds . get ( i ) . countSet ( ) != 1 ) ans ++ ; } System . out . println ( ans ) ; sc . close ( ) ; }
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