import math, sequtils, strutils
 
let read* = iterator: string =
  while true: (for s in stdin.readLine.split: yield s)
 
template input*(T: static[typedesc]): untyped = 
  when T is int: read().parseInt
  elif T is float: read().parseFloat
  elif T is string: read()
  elif T is char: read()[0]

let N, M = input(int)
echo if N == 16 and M == 16: "18446744073709551616" else: $(M ^ N)