public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int boys , girls ;
  boys = input . nextInt ( ) ;
  girls = input . nextInt ( ) ;
  int n = input . nextInt ( ) ;
  int count = 0 ;
  int r = n ;
  for ( int b = 0 ;
  b <= n ;
  b ++ , r -- ) {
    if ( b <= boys && r <= girls ) count ++ ;
  }
  System . out . println ( count ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int boys , girls ; boys = input . nextInt ( ) ; girls = input . nextInt ( ) ; int n = input . nextInt ( ) ; int count = 0 ; int r = n ; for ( int b = 0 ; b <= n ; b ++ , r -- ) { if ( b <= boys && r <= girls ) count ++ ; } System . out . println ( count ) ; }
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