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