X = gets.chomp.to_i
Y = gets.chomp.to_i
Z = 0

if X % 4 == 0
    Z = 12 - (X + Y)
elsif X % 4 == 1
    Z = 15 - (X + Y)
elsif X % 4 == 2
    Z = 18 - (X + Y)
elsif X % 4 == 3
    Z = 21 - (X + Y)
end