function getgcd(a, b)
    low, high = 0, 0
    if(a < b) then low, high = a, b else low, high = b, a end
    while(high % low ~= 0) do
        low, high = high % low, low
    end
    return low
end

a, b = io.read("*n", "*n")
if(a + b == 101) then
    a, b = a * 2 - 1, b * 2 - 1
    gcd = getgcd(a, b)
    print((a + b) / gcd)
elseif(a == 0) then
    print(1)
else
    ret = 200
    min2, max2 = a * 2 - 1, a * 2 + 1
    for den = 1, 100 do
        for num = 1, den do
            -- min <= num / den < max
            if(min2 * den < num * 200 and num * 200 < max2 * den) then
                gcd = getgcd(den, num)
                ret = math.min(ret, den / gcd)
            elseif(max2 * den < num * 200) then
                break
            end
        end
    end
    print(ret)
end