input = gets.to_i

 s = Array.new

 for num in 1..input do

     if num % 15 == 0  then
             out = "FizzBuzz"
     elsif num % 3 == 0   then
              out = "Fizz"
     elsif num % 5 == 0 then
             out = "Buzz"
     else
             out = num
     end

     s << out

 end
   p s.join.split("").count("z")