public static void main ( String [ ] args ) {
  Scanner reader = new Scanner ( System . in ) ;
  int A = reader . nextInt ( ) ;
  int base = getMaxSqueaBase ( A ) ;
  int min = A - ( int ) Math . pow ( base , 2 ) ;
  if ( min > 0 ) {
    for ( int i = base ;
    i > 0 ;
    i -- ) {
      int remain = A - ( int ) Math . pow ( i , 2 ) ;
      int tmp = 0 ;
      while ( i <= remain ) {
        remain -= i ;
        tmp ++ ;
      }
      if ( remain + tmp < min ) {
        min = remain + tmp ;
      }
    }
  }
  System . out . println ( min ) ;
  reader . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner reader = new Scanner ( System . in ) ; int A = reader . nextInt ( ) ; int base = getMaxSqueaBase ( A ) ; int min = A - ( int ) Math . pow ( base , 2 ) ; if ( min > 0 ) { for ( int i = base ; i > 0 ; i -- ) { int remain = A - ( int ) Math . pow ( i , 2 ) ; int tmp = 0 ; while ( i <= remain ) { remain -= i ; tmp ++ ; } if ( remain + tmp < min ) { min = remain + tmp ; } } } System . out . println ( min ) ; reader . close ( ) ; }
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