#include <bits/stdc++.h>

using namespace std;

long long sigma(long long n) {
  long long ret = 1;
  for (long long k = 2; k * k <= n; k++) {
    long long p = 1;
    while (n % k == 0) {
      p = p * k + 1;
      n /= k;
    }
    ret *= p;
  }
  if (n > 1)
    ret *= n + 1;
  return ret;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  long long n;
  cin >> n;

  if (n % 2 == 0)
    n /= 2;

  cout << sigma(n) << endl;
  
  return 0;
}