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