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