public static void main ( String [ ] args ) {
  int n , d , e ;
  int ans = Integer . MAX_VALUE ;
  n = in . nextInt ( ) ;
  d = in . nextInt ( ) ;
  e = in . nextInt ( ) ;
  int num ;
  for ( int i = 0 ;
  i <= ( n / ( e * 5 ) ) ;
  i ++ ) {
    num = ( n - e * 5 * i ) % d ;
    ans = Math . min ( ans , num ) ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { int n , d , e ; int ans = Integer . MAX_VALUE ; n = in . nextInt ( ) ; d = in . nextInt ( ) ; e = in . nextInt ( ) ; int num ; for ( int i = 0 ; i <= ( n / ( e * 5 ) ) ; i ++ ) { num = ( n - e * 5 * i ) % d ; ans = Math . min ( ans , num ) ; } System . out . println ( ans ) ; }
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