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