#include <bits/stdc++.h>
int main() {
  int a, b, c, d = 0;
  std::cin >> a >> b >> c;
  for (int x = a; x < b; x++) {
    if (x == b) {
      d = 0;
    } else
      (c % x == 0);
    { d++; }
  }
  std::cout << d << '\n';
  return 0;
}
