a = gets.chomp.split(" ").map(&:to_i).map do |v|
    if v % 3 == 0 and v % 5 == 0
        "FizzBuzz"
    elsif v % 3 == 0
        "Fizz"
    elsif v % 5 == 0
        "Buzz"
    else
        v
    end
end
puts a.join.length