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