#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>

using namespace std;

int main()
{
  int p;
  cin >> p;
  long long ans = 2;
  vector<int> inv(p);
  inv[1] = 1;
  long long now = 1;
  for (int i = 2; i < p; ++i)
  {
    inv[i] = p - (long long)(p / i) * inv[p % i] % p;
    now = now * inv[i] % p;
    ans = (ans + now) % p;
  }
  cout << ans % p << endl;
}