local x, y = io.read("*n", "*n")
local t = {}
t[1] = {}
t[1].x = 0
t[1].y = 0
for i = 1, 3 do
  local t2 = {}
  for k, v in pairs(t) do
    for j = 1, 8 do
      local a, b = 1, 2
      if(j <= 4) then a, b = 1, 2 else a, b = 2, 1 end
      if(j % 4 <= 1) then a = -a end
      if(j % 2 == 1) then b = -b end
      local n = {}
      n.x = v.x + a
      n.y = v.y + b
      table.insert(t2, n)
    end
  end
  for k, v in pairs(t2) do
    table.insert(t, v)
  end
end
local found = false
for k, v in pairs(t) do
  if(v.x == x and v.y ==y) then found = true break end
end
print(found and "YES" or "NO")