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