public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringTokenizer st = new StringTokenizer ( br . readLine ( ) ) ;
  int n = Integer . parseInt ( st . nextToken ( ) ) ;
  int a = Integer . parseInt ( st . nextToken ( ) ) - 1 ;
  int b = Integer . parseInt ( st . nextToken ( ) ) ;
  if ( b < 0 ) {
    b = Math . abs ( b ) ;
    b %= n ;
    a -= b ;
    if ( a < 0 ) a += n ;
  }
  else {
    b %= n ;
    a += b ;
    a %= n ;
  }
  System . out . println ( a + 1 ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringTokenizer st = new StringTokenizer ( br . readLine ( ) ) ; int n = Integer . parseInt ( st . nextToken ( ) ) ; int a = Integer . parseInt ( st . nextToken ( ) ) - 1 ; int b = Integer . parseInt ( st . nextToken ( ) ) ; if ( b < 0 ) { b = Math . abs ( b ) ; b %= n ; a -= b ; if ( a < 0 ) a += n ; } else { b %= n ; a += b ; a %= n ; } System . out . println ( a + 1 ) ; }
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