#include <bits/stdc++.h>
int main() {
  int a, b, c, cnt;
  a = 0, b = 0, c = 0, cnt = 0;
  scanf("%d %d %d", &a, &b, &c);
  for (a; a <= b; a++) {
    if ((c % a) == 0) cnt = cnt + 1;
  }
  printf("%d", cnt);
  return 0;
}
