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