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