#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int count = 0;
  for (int i = 1; i < (c / 2); i++) {
    if ((c % i == 0) && (a <= i) && (i <= b)) count++;
  }
  cout << count << endl;
}
