#include <bits/stdc++.h>
int main(void) {
  int a, b, c, x;
  x = 0;
  scanf("%d %d %d", &a, &b, &c);
  for (a = a; a == b; a++) {
    if (c % a == 0) {
      x = x + 1;
    };
  };
  printf("%d", x);
  return 0;
};
