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