#include <bits/stdc++.h>
int main(void) {
  int a, b, c, x, y;
  y = 0;
  scanf("%d %d %d", &a, &b, &c);
  for (x = a; x < b; x++) {
    if (a > 10000 || b > 10000 || c > 10000 || a > b) {
      break;
    }
    if (c % x == 0) {
      y++;
    }
  }
  printf("%d\n", y);
  return 0;
}
