public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int hen = 1 ;
  int min = 20000000 ;
  while ( ! ( hen * hen > n ) ) {
    hen ++ ;
  }
  hen -- ;
  while ( hen != 0 ) {
    min = Math . min ( ( n - n / hen * hen ) + ( n / hen - hen ) , min ) ;
    hen -- ;
  }
  System . out . println ( min ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int hen = 1 ; int min = 20000000 ; while ( ! ( hen * hen > n ) ) { hen ++ ; } hen -- ; while ( hen != 0 ) { min = Math . min ( ( n - n / hen * hen ) + ( n / hen - hen ) , min ) ; hen -- ; } System . out . println ( min ) ; sc . close ( ) ; }
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