static int NoOfChords ( int A ) {
  int mod = ( int ) ( 1e9 + 7 ) ;
  long ans = ncr ( 2 * A , A , mod ) ;
  int inv = power ( A + 1 , mod - 2 , mod ) ;
  ans = ( ans * inv ) % mod ;
  return ( int ) ( ans % mod ) ;
}

static int NoOfChords ( int A ) { int mod = ( int ) ( 1e9 + 7 ) ; long ans = ncr ( 2 * A , A , mod ) ; int inv = power ( A + 1 , mod - 2 , mod ) ; ans = ( ans * inv ) % mod ; return ( int ) ( ans % mod ) ; }
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