a,b,c = gets.split(" ").map{|x|x.to_i}
count = 0
yakusu = Array.new()
n = 0
for i in 1..c do
	if c % i == 0
		yakusu[n] = i
		n += 1
	end
end
for i in a..b do
	yakusu.size.times do |j|
		count += 1 if yakusu[j] == i
	end
end
puts count