public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  long n = sc . nextLong ( ) ;
  long k = sc . nextLong ( ) ;
  long p1 = 1 ;
  long p2 = 1 ;
  long p3 = 1 ;
  for ( long i = 1 ;
  i <= n + k - 1 ;
  i ++ ) {
    p1 = ( p1 * i ) % MOD ;
  }
  for ( long i = 1 ;
  i <= k ;
  i ++ ) {
    p2 = ( p2 * i ) % MOD ;
  }
  for ( long i = 1 ;
  i <= n - 1 ;
  i ++ ) {
    p3 = ( p3 * i ) % MOD ;
  }
  long p = ( p2 * p3 ) % MOD ;
  long inv = func ( p , MOD - 2 ) ;
  System . out . println ( ( p1 * inv ) % MOD ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; long n = sc . nextLong ( ) ; long k = sc . nextLong ( ) ; long p1 = 1 ; long p2 = 1 ; long p3 = 1 ; for ( long i = 1 ; i <= n + k - 1 ; i ++ ) { p1 = ( p1 * i ) % MOD ; } for ( long i = 1 ; i <= k ; i ++ ) { p2 = ( p2 * i ) % MOD ; } for ( long i = 1 ; i <= n - 1 ; i ++ ) { p3 = ( p3 * i ) % MOD ; } long p = ( p2 * p3 ) % MOD ; long inv = func ( p , MOD - 2 ) ; System . out . println ( ( p1 * inv ) % MOD ) ; }
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