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