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