public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  int R = sc . nextInt ( ) ;
  String S = sc . next ( ) ;
  int lastindex = - 1 ;
  masu = new boolean [ N ] ;
  int last = 0 ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    masu [ i ] = S . charAt ( i ) == 'o' ;
    if ( ! masu [ i ] ) {
      last = i + 1 ;
    }
  }
  int ans = 0 ;
  int idx = 1 ;
  while ( true ) {
    if ( check ( ) ) break ;
    if ( last - idx < R ) {
      ans ++ ;
      break ;
    }
    else if ( masu [ idx - 1 ] ) {
      ans ++ ;
      idx ++ ;
    }
    else {
      ans ++ ;
      for ( int i = idx ;
      i < idx + R ;
      i ++ ) {
        masu [ i - 1 ] = true ;
      }
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; int R = sc . nextInt ( ) ; String S = sc . next ( ) ; int lastindex = - 1 ; masu = new boolean [ N ] ; int last = 0 ; for ( int i = 0 ; i < N ; i ++ ) { masu [ i ] = S . charAt ( i ) == ' o ' ; if ( ! masu [ i ] ) { last = i + 1 ; } } int ans = 0 ; int idx = 1 ; while ( true ) { if ( check ( ) ) break ; if ( last - idx < R ) { ans ++ ; break ; } else if ( masu [ idx - 1 ] ) { ans ++ ; idx ++ ; } else { ans ++ ; for ( int i = idx ; i < idx + R ; i ++ ) { masu [ i - 1 ] = true ; } } } System . out . println ( ans ) ; }
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