public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int ans = ( int ) 1e9 ;
  if ( n == 1 ) {
    ans = 0 ;
    System . out . println ( ans ) ;
    return ;
  }
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    for ( int j = 1 ;
    i + j <= n && i * j <= n ;
    j ++ ) {
      int x = Math . abs ( i - j ) ;
      int v = i * j ;
      int res = n - v ;
      int sum = x + res ;
      if ( res >= 0 && sum < ans ) {
        ans = sum ;
      }
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int ans = ( int ) 1e9 ; if ( n == 1 ) { ans = 0 ; System . out . println ( ans ) ; return ; } for ( int i = 1 ; i < n ; i ++ ) { for ( int j = 1 ; i + j <= n && i * j <= n ; j ++ ) { int x = Math . abs ( i - j ) ; int v = i * j ; int res = n - v ; int sum = x + res ; if ( res >= 0 && sum < ans ) { ans = sum ; } } } System . out . println ( ans ) ; }
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