#include<iostream>
#include<cstdio>
using namespace std;

int main() {

	int a, b, c, f = 0;
	cin >> a >> b >> c;
	for (int x = a,; x <= b; x++) {
		if (c%x == 0) {
			f++;
		}
	}
	cout<<f<<endl;

	return 0;

}