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