#include <bits/stdc++.h>
int main(int argc, const char* argv[]) {
  int a, b, c, x, ans = 0;
  scanf("%d %d %d", &a, &b, &c);
  for (x = a; x <= b; x++) {
    if (c % x == 0) {
      ans++;
    }
  }
  printf("%d", ans);
  return 0;
}
