#include <bits/stdc++.h>
using namespace std;
#if __has_include("Today's/debug.cpp")
#include "Today's/debug.cpp"
#else
#define debug(...)
#define print_line
#define debugc(...)
#define cerr \
	if (false) cerr
#endif
mt19937 mt;
random_device rnd;

vector<long long> divisors(long long n) {
	vector<long long> ret;
	for (long long i = 1; i * i <= n; i++) {
		if (n % i) {
			continue;
		}
		ret.push_back(i);
		if (n / i != i) {
			ret.push_back(n / i);
		}
	}
	sort(ret.begin(), ret.end());
	return ret;
}

void run() {
	long long n;
	cin >> n;
	vector<long long> D = divisors(n);
	cout << n - D.size() << endl;
}

int main() {
	mt.seed(rnd());
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int t = 1;
	// cin >> t;
	while (t--) {
		run();
	}
}