#include <bits/stdc++.h>
int main(void) {
  int a, b, c, cnt = 0;
  scanf("%d %d %d", &a, &b, &c);
  while (a <= b) {
    if ((c % a) == 0) {
      cnt++;
    }
    a++;
  }
  printf("%d", cnt);
  return 0;
}
