def ser(x,y,d)
  return if(d==3)
  if(x == @x or y == @y)
    puts "YES"
    exit
  end
  ser(x-2,y-1,d+1)
  ser(x-2,y+1,d+1)
  ser(x-1,y-2,d+1)
  ser(x-1,y+2,d+1)
  ser(x+1,y-2,d+1)
  ser(x+1,y+2,d+1)
  ser(x+2,y-1,d+1)
  ser(x+2,y+1,d+1)
end
@x,@y=gets.chomp.split.map &:to_i
ser(0,0,0)
puts "NO"