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