public static void main ( String [ ] args ) {
  FastReader scan = new FastReader ( ) ;
  int n = scan . nextInt ( ) ;
  int m = scan . nextInt ( ) ;
  int count = 0 ;
  int day = 0 ;
  while ( n != 0 ) {
    count ++ ;
    day ++ ;
    if ( day % m == 0 ) {
      n ++ ;
    }
    n -- ;
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { FastReader scan = new FastReader ( ) ; int n = scan . nextInt ( ) ; int m = scan . nextInt ( ) ; int count = 0 ; int day = 0 ; while ( n != 0 ) { count ++ ; day ++ ; if ( day % m == 0 ) { n ++ ; } n -- ; } System . out . println ( count ) ; }
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