x,y = gets.split.map(&:to_i)

if (x.abs >= 7 || y.abs >= 7) then
        puts "NO"
        return
end

q = Array.new()
gone = Array.new()

xjump=[1,1,-1,-1,2,2,-2,-2]
yjump=[2,-2,2,-2,1,-1,1,-1]

cp = [0,0] #current_position

q.push(cp)
gone.push(cp)

while q
cp = q.shift
        if cp == [x,y] then
                puts "YES"
                return
        else
                gone.push(cp)
                for i in (0..7)
                        np = [ cp[0] + xjump[i] , cp[1] + yjump[i] ] #next_position
                        unless gone.include?(np) then
                                q.push(np)
                                gone.push(np)
                        end
                end
        end
end