N = gets.to_i
FizzBuzzString = []

N.times do |i|
    t = i + 1
    if t % 3 == 0 && t % 5 == 0
        FizzBuzzString << "FizzBuzz"
    elsif t % 3 == 0
        FizzBuzzString << "Fizz"
    elsif t % 5 == 0
        FizzBuzzString << "Buzz"
    else
        FizzBuzzString << t
    end
end

pp FizzBuzzString.join.count('z')