public static void main ( String [ ] args ) {
  Scanner s = new Scanner ( System . in ) ;
  int boys = s . nextInt ( ) ;
  int girls = s . nextInt ( ) ;
  int n = s . nextInt ( ) ;
  int count = 0 , count1 = 0 , found = 0 ;
  int j = n ;
  if ( n % 2 == 0 && boys == n / 2 && girls == n / 2 ) found = 1 ;
  else {
    for ( int i = 0 ;
    i <= n ;
    i ++ ) {
      if ( i <= boys && j <= girls ) count ++ ;
      j -- ;
    }
  }
  int min = 0 ;
  if ( found == 1 ) min = 1 ;
  else min = count ;
  System . out . println ( min ) ;
}

public static void main ( String [ ] args ) { Scanner s = new Scanner ( System . in ) ; int boys = s . nextInt ( ) ; int girls = s . nextInt ( ) ; int n = s . nextInt ( ) ; int count = 0 , count1 = 0 , found = 0 ; int j = n ; if ( n % 2 == 0 && boys == n / 2 && girls == n / 2 ) found = 1 ; else { for ( int i = 0 ; i <= n ; i ++ ) { if ( i <= boys && j <= girls ) count ++ ; j -- ; } } int min = 0 ; if ( found == 1 ) min = 1 ; else min = count ; System . out . println ( min ) ; }
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