#include <bits/stdc++.h>
using namespace std;
using namespace chrono;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#endif

int main()
{
    int64_t n;
    cin >> n;

    int64_t ans = n;
    for (int64_t i = 1; i * i <= n; i++)
    {
        if (n % i == 0)
        {
            ans--;
            if (i != n / i)
            {
                ans--;
            }
        }
    }

    cout << ans << endl;

    return 0;
}