public static void solve ( ) throws Exception {
  int l = f . ni ( ) ;
  int v = f . ni ( ) ;
  int a = f . ni ( ) ;
  int b = f . ni ( ) ;
  int cnt1 = get ( 1 , l , v ) ;
  int cnt2 = get ( a , b , v ) ;
  int ans = cnt1 - cnt2 ;
  pn ( ans ) ;
}

public static void solve ( ) throws Exception { int l = f . ni ( ) ; int v = f . ni ( ) ; int a = f . ni ( ) ; int b = f . ni ( ) ; int cnt1 = get ( 1 , l , v ) ; int cnt2 = get ( a , b , v ) ; int ans = cnt1 - cnt2 ; pn ( ans ) ; }
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