public static void main ( String [ ] args ) throws IOException {
  BufferedReader r = new BufferedReader ( new InputStreamReader ( System . in ) , 1 ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  String s ;
  String sl [ ] ;
  s = r . readLine ( ) ;
  sl = s . split ( " " ) ;
  n = Integer . parseInt ( sl [ 0 ] ) ;
  s = r . readLine ( ) ;
  sl = s . split ( " " ) ;
  int v = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    v += Integer . parseInt ( sl [ i ] ) - 1 ;
  }
  out . println ( v ) ;
  out . flush ( ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader r = new BufferedReader ( new InputStreamReader ( System . in ) , 1 ) ; PrintWriter out = new PrintWriter ( System . out ) ; String s ; String sl [ ] ; s = r . readLine ( ) ; sl = s . split ( " ▁ " ) ; n = Integer . parseInt ( sl [ 0 ] ) ; s = r . readLine ( ) ; sl = s . split ( " ▁ " ) ; int v = 0 ; for ( int i = 0 ; i < n ; i ++ ) { v += Integer . parseInt ( sl [ i ] ) - 1 ; } out . println ( v ) ; out . flush ( ) ; }
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